Journals >Journal of Infrared and Millimeter Waves
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2017
Volume: 36 Issue 6
29 Article(s)
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Performance of terahertz channel with multiple input multiple output techniques
M.Bharathi, S. Sasikala, and J. Vanmathi
Terahertz (THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in Terahertz (THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band, wireless THz communication can be used for relatively short distances. Even, for a distance of few meters (>5 m), the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades. Multiple Input Multiple Output (MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate (BER) is considerably improved for short distance (<5 m) with MIMO. However, as the distance increases, the improvement in the error performance is not significant even with increase in the order of diversity. This is because, as distance increases, in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 641 (2017)
Preparation and characterization of Eu2+-doped GaN luminescent nanofibers by electrospinning method
CHEN Yu, WEI Xue-Cheng, and LIU Hong-Wei
Eu2+-doped GaN (GaN:Eu2+) nanofibers were synthesized by a facile approach that combined electrospinning and ammonification techniques. SEM and TEM images revealed that the nanofibers consist of GaN nanoparticles with uniform size. XRD result showed that the GaN:Eu2+ sample predominantly exhibited the hexagonal phase oEu2+-doped GaN (GaN:Eu2+) nanofibers were synthesized by a facile approach that combined electrospinning and ammonification techniques. SEM and TEM images revealed that the nanofibers consist of GaN nanoparticles with uniform size. XRD result showed that the GaN:Eu2+ sample predominantly exhibited the hexagonal phase of GaN (h-GaN) and the average grain size was evaluated to be 7.3 nm. Further Raman characterization showed that two extra GaN Raman shifts with the peaks of 252 and 422 cm-1 were observed. As was expected, characteristic strong blue emission from Eu2+ ions doped in GaN matrix was observed at 407 nm in the photoluminescence spectrum..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 646 (2017)
A 220 GHz high integration and high resolution detector
CUI Da-Sheng, DING Zheng-Zhi, HAO Hai-Dong, and LV Xin
A high-integration detector which consists of a patch antenna, a matching circuit, schottky diodes (SBD) and lenses has been developed. The integration of detectors is increased obviously comparing with that of separated detectors by integrating antennas, matching circuits and SBD on a chip in SMIC 130 mm. To improve tA high-integration detector which consists of a patch antenna, a matching circuit, schottky diodes (SBD) and lenses has been developed. The integration of detectors is increased obviously comparing with that of separated detectors by integrating antennas, matching circuits and SBD on a chip in SMIC 130 mm. To improve the directivity of the antenna on chip, the nylon lens with air cave was designed and optimized. The air cave in lens not only provides space for assembling but also reduces the size of lens. It was calculated through testing that the antenna gain at 220 GHz is 22 dB, in which the contribution of lens is about 20 dB. The tested responsivity of the detector can achieve 130-150 V/W and the noise equivalent power (NEP) is estimated to be 400~460 pW/Hz..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 650 (2017)
Grating rectangular waveguide for THz backward wave oscillator
ZHANG Kai-Chun, CHEN Ke, WANG Qi, SHENG Chang-Jian, and YUAN Xue-Song
A slow-wave structure (SWS) composed of a grating inside a rectangular waveguide is adopted as the circuit of the backward wave oscillator (BWO) in terahertz regime in this paper. Its dispersion curves and interaction impedance are presented by an analytical method and three-dimensional (3-D) electromagnetic software. A slow-wave structure (SWS) composed of a grating inside a rectangular waveguide is adopted as the circuit of the backward wave oscillator (BWO) in terahertz regime in this paper. Its dispersion curves and interaction impedance are presented by an analytical method and three-dimensional (3-D) electromagnetic software. The results by analysis and simulation agree well. By optimization, a BWO with the SWS at a central frequency 340 GHz is fully verified by 3-D particle-in-cell (PIC) code. The BWO is demonstrated with more than 100 mW output power at very low current density and 30 GHz tuning bandwidth..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 655 (2017)
Optimized coupling loss between single mode fiber and hollow-core photonic crystal fiber for Raman gas detection
ZHANG Xiu-Mei, JIANG Shu-Bo, and WANG Xu
In this investigation, the coupling losses caused by Fresnel reflection, core misalignment between single mode fiber (SMF) and HC-PCF are analyzed. A novel solution proposed from this research will reduce the coupling losses by using a T-type tube as a connector. Meanwhile, the theoretically calculated optimized gaps aIn this investigation, the coupling losses caused by Fresnel reflection, core misalignment between single mode fiber (SMF) and HC-PCF are analyzed. A novel solution proposed from this research will reduce the coupling losses by using a T-type tube as a connector. Meanwhile, the theoretically calculated optimized gaps are at 15 μm in SMF-HCPCF direction and 25 μm in HCPCF-SMF direction. Thus, an experiment has been carried out, and the results of the practical gap in the above mentioned two directions have also been obtained. Furthermore, compared with detection by traditional methods, the proposed new detection method with PCF can remarkably enhance the Raman spectroscopy signal. Finally, the prospect of using the combination of HC-PCF and Raman spectroscopy in gas-cell detection has been demonstrated by using oxygen and nitrogen..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 660 (2017)
An infrared heat transfer in biological tissue
LI Chen-Jing, XU Xue-Mei, and CHANG Xiao-Rong
Combined with the fundamental theorems of thermodynamics and the heat radiation theory, Pennes bioheat equation is improved, which can describe the thermal process in tissue subject to heat stimulation of moxibustion more vividly. Applying the Green function method, we derive the analytical solution of the equation andCombined with the fundamental theorems of thermodynamics and the heat radiation theory, Pennes bioheat equation is improved, which can describe the thermal process in tissue subject to heat stimulation of moxibustion more vividly. Applying the Green function method, we derive the analytical solution of the equation and establish a straightforward way to quantitatively interpret the temperature behavior of living tissues, such as healthy tissue, tumor tissue, non-acupoint tissue and acupoint tissue, as a result of moxibustion. The concept of temperature attenuation coefficient (TAC) is proposed to measure the energy absorption at different depth of tissue. The coherence between the simulation and experiment about surface temperature demonstrates the flexibility and availability of the solution. The oscillation energy flow has a mild stimulus to the biological tissues, which is an advantageous physical exciter for organization to achieve its good functions. Our results reveal that the heat with high frequency is mainly absorbed by the surface layer, while that of low frequency can deeply penetrate into the living biological parts. Significantly, the diseases can be treated by moxibustion heat through the role of deep penetration..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 665 (2017)
The sensitivity of mirrored aperture synthesis millimeter-wave radiometry
CHEN Liang-Bing, WANG Yu-Hao, and ZHOU Hui-Lin
Mirrored aperture synthesis (MAS) has been proposed to utilize a few antennas to provide high spatial resolution for Earth remote sensing. But the sensitivity of MAS is not completely analyzed. For this problem, the characteristic of the noise in 2-D MAS is derived. Further, both the sensitivity of 1-D and 2-D MAS are Mirrored aperture synthesis (MAS) has been proposed to utilize a few antennas to provide high spatial resolution for Earth remote sensing. But the sensitivity of MAS is not completely analyzed. For this problem, the characteristic of the noise in 2-D MAS is derived. Further, both the sensitivity of 1-D and 2-D MAS are analyzed. Numerical simulations are carried out to evaluate the sensitivity of a MAS system, and comparisons between the sensitivity of MAS and traditional aperture synthesis are made..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 673 (2017)
The MRC matched filter model of terahertz active focal plane imaging system
TIAN Li, JIN Wei-Qi, CAI Yi, and WANG Xia
Based on the characteristics of terahertz source and focal plane detector, the minimum resolvable contrast(MRC) matched filter model of terahertz active imaging system is established by considering the influence of target-background characteristic, atmospheric attenuation and device attenuation. The MRC model is validaBased on the characteristics of terahertz source and focal plane detector, the minimum resolvable contrast(MRC) matched filter model of terahertz active imaging system is established by considering the influence of target-background characteristic, atmospheric attenuation and device attenuation. The MRC model is validated by combining the literature examples and the experimental results of the actual terahertz focal plane active imaging system. The results show that the measured value and the calculated value are basically the same, with the error in the reasonable range, which shows the validity of the model..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 680 (2017)
Real-time γ irradiation effects on long-wavelength InAs/GaSb Type II superlattice infrared detector
JIN Chuan, XU Jia-Jia, HUANG Ai-Bo, XU Zhi-Cheng, ZHOU Yi, BAI Zhi-Zhong, WANG Fang-Fang, CHEN Jian-Xin, CHEN Hong-Lei, DING Rui-Jun, and HE Li
In this paper, the γ-irradiation effect on InAs / GaSb II superlattice long-wave detectors was studied. The detector has a good anti-radiation performance under the irradiation of 60Co γ-rays as the current-voltage (I-V) characteristics of the devices did not change significantly with the increase of the irradiation doIn this paper, the γ-irradiation effect on InAs / GaSb II superlattice long-wave detectors was studied. The detector has a good anti-radiation performance under the irradiation of 60Co γ-rays as the current-voltage (I-V) characteristics of the devices did not change significantly with the increase of the irradiation dose. Compared with the value before irradiation, the reduction rate of the zero-bias resistance was only 3.4% under the irradiation dose of 100 krad (Si). By combining the real-time I-V curves at different irradiation doses and the evolution of the current with time after the irradiation, the damage and the corresponding mechanism of the γ-irradiation were analyzed. At zero bias as well as small reverse bias, the current is obviously increased after irradiation. The radiation damage is dominated by the transient ionization effect, and the device performance can be recovered in a short time. While at large reverse bias, the main dark current mechanism is the direct tunneling current, leading to a decreased dark current with the increase of the irradiation dose. The time of the damage recovery is significantly longer than that of the ionization damage, and an annealing may be required..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 688 (2017)
NPP/VIIRS solar reflectance bands radiation validation based on mid-infrared reference standard on sea surface sun glint sites
JING Xin, YAN Lei, HU Xiu-Qing, HE Li-Qin, ZHAO Shuai-Yang, HU Xing-Bang, XU Han-Lie, LIN Yi, and MA Ai-Nai
This paper built up the reflectance relationship between MWIR and solar reflectance bands based on Fresnel’s law. VIIRS (Visible Infrared Imaging Radiometer) mid-infrared band (3697μm) has been used as the reference standard to validate the four solar reflectance bands (0.672、0.862、1238 and 1.602 μm) on sea surface sThis paper built up the reflectance relationship between MWIR and solar reflectance bands based on Fresnel’s law. VIIRS (Visible Infrared Imaging Radiometer) mid-infrared band (3697μm) has been used as the reference standard to validate the four solar reflectance bands (0.672、0.862、1238 and 1.602 μm) on sea surface sun glint regions. Finally the uncertainties of this validation model were analyzed. The results show that the uncertainties of the four solar reflectance bands are 3.8%、3.9%、4.1%、4.1%, respectively. Therefore, the model proposed in this paper can be used for optical inter bands cross validation..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 694 (2017)
Identification of soot particles in air based on polarization scattering method
LI Da, ZENG Nan, ZENG Mao-Mao, LIAO Ran, and MA Hui
In this paper, a polarization character was proposed focusing on the evaluation of soot content in the air based on our polarized photon scattering simulation program. The simulation results demonstrate that the polarization parameter at a specific scattering angle can identify the soot particles from other air pollutaIn this paper, a polarization character was proposed focusing on the evaluation of soot content in the air based on our polarized photon scattering simulation program. The simulation results demonstrate that the polarization parameter at a specific scattering angle can identify the soot particles from other air pollutants. The corresponding experiments classified the preliminary study. Compared with non-polarization optical measurement, polarization characterization can not only be improved from the current non-polarization scattering instrument, but also enhance the contrast of distinguishing different type particles and optimize the detection setup..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 701 (2017)
Terahertz first-order distributed feedback quantum cascade laser with light extraction via a diffraction grating
ZHU Huan, WANG Fang-Fang, YAN Quan, YU Chen-Ren, CHANG Gao-Lei, CHEN Jian-Xin, XU Gang-Yi, and HE Li
We have studied two different kinds of terahertz first-order distributed feedback quantum cascade lasers (THz-DFB-QCL), both of which are based on a metal-metal waveguide. To realize stable single-mode emission, we have demonstrated for the first time THz-DFB-QCLs in which THz wave is extracted via a diffraction gratinWe have studied two different kinds of terahertz first-order distributed feedback quantum cascade lasers (THz-DFB-QCL), both of which are based on a metal-metal waveguide. To realize stable single-mode emission, we have demonstrated for the first time THz-DFB-QCLs in which THz wave is extracted via a diffraction grating. Our simulations illustrate that an optimized diffraction grating will give rise to a diffraction efficiency of about 70%, and a reflectivity less than 1%. It will also result in a laser beam pattern with a low divergence angle of 10°×50°. Such a low reflectivity will keep the mode oscillation inside the DFB grating undisturbed, which is crucial to realize stable single-mode emission. Experimentally, by utilizing a diffraction grating to extract THz wave, we have realized THz-DFB-QCLs with stable single-mode emission near 2.58 THz and the side-mode-suppression-ratio is about 23 dB. The measured laser beam pattern is in good agreement with the calculations. Most importantly, due to the good diffraction efficiency and beam directionality, the diffraction grating based THz-DFB-QCL significantly improves the output power compared with the edge-emitting counterpart..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 706 (2017)
Target-characteristics-based equivalent blur model for under-sampled imaging systems
YANG Cui, YIN Shu-Ting, ZHANG Yan-Tao, and WU Xin
Considering the human visual characteristics, a target-characteristics-based equivalent blur model for under-sampled imaging systems is proposed. The introduction into the model of the tolerance of the under-sampling system to the spurious response and the effective frequency spectrum makes the newly proposed model morConsidering the human visual characteristics, a target-characteristics-based equivalent blur model for under-sampled imaging systems is proposed. The introduction into the model of the tolerance of the under-sampling system to the spurious response and the effective frequency spectrum makes the newly proposed model more accurate in the prediction of the target discrimination performance of an under-sampled imaging system..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 713 (2017)
Automatic registration of optical and SAR image using geometric structural properties
YE Yuan-Xin, HAO Si-Yuan, and CAO Yun-Gang
This paper proposes an automatic registration method for optical and Synthetic Aperture Radar (SAR) images based on geometric structural properties. In the proposed method, the phase congruency feature with photometric invariance is first introduced for image feature extraction, and then both the magnitude and orientatThis paper proposes an automatic registration method for optical and Synthetic Aperture Radar (SAR) images based on geometric structural properties. In the proposed method, the phase congruency feature with photometric invariance is first introduced for image feature extraction, and then both the magnitude and orientation information of phase congruency are used to build a geometric structural feature descriptor named HOPC (Histogram of Orientated Phase Congruency). A similarity metric named HOPCn is defined for image matching by using the Euclidean distance of the descriptors. This similarity metric can capture the geometric structural similarity between images, and has been tested using 4 pairs of optical and SAR images. Experimental results show that HOPCn is robust to non-linear radiometric differences, and outperforms the state-of-the-art similarity metrics such as correlation coefficient and mutual information. Moreover, this paper also design an automatic registration method based on HOPCn. Experimental results demonstrate the effectiveness and robustness of the proposed method..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 720 (2017)
Optical time domain reflectometer based on dual repetition rates
HUANG Ren-Gui, CHEN Jie, LIANG Yan, SHEN Xu-Ling, and ZENG He-Ping
An optical time domain reflectometer with dual repetition rates was proposed based on the single photon detector with InGaAs/InP avalanche photodiode. Two arrays of laser pulses with slight different repetition rates were injected into the fiber to monitor the fiber broken point. A fast single photon detector was adoptAn optical time domain reflectometer with dual repetition rates was proposed based on the single photon detector with InGaAs/InP avalanche photodiode. Two arrays of laser pulses with slight different repetition rates were injected into the fiber to monitor the fiber broken point. A fast single photon detector was adopted for high sensitivity in reflected pulses detection with reduced measurement time. By adjusting the difference of the repetition rates, not only the measuring range of the system can be extended ,but also the measurement accuracy can be changed..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 727 (2017)
Design and analysis of super large width and low distortion imaging system
ZHANG Zong-Cun, DING Xue-Zhuan, YANG Bo, ZHANG-Ying, PENG Jun, and LIU Yin-Nian
In the way of pursing large width and high resolution imaging, ground imaging distortion is an important factor that needs to be eliminated, therefore, a zoom scanning combine with adjustable slit diaphragm imaging method was proposed in this paper. The corresponding control formula of zoom scanning and slit were deducIn the way of pursing large width and high resolution imaging, ground imaging distortion is an important factor that needs to be eliminated, therefore, a zoom scanning combine with adjustable slit diaphragm imaging method was proposed in this paper. The corresponding control formula of zoom scanning and slit were deduced. Results show that, under appropriate controlling, this method could effectively reduce the ground distortion brought by the increase of the scanning angle and can maintain the ground resolution to be unchanged (same as the resolution under sub-satellite point) during a wide scan imaging process. Besides, a zoom swing scanning imaging system was designed to verify the feasibility of our method in large width and high resolution imaging applications. This is of great significance for the development of large width and high resolution imaging observation..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 732 (2017)
Preparation and infrared stealth properties of three-dimensional ordered photonic crystals
ZHANG Rui-Rong, QIU Gui-Hua, HAN Jian-Long, WANG Yi-Ke, PAN Shi-Bing, ZHANG Yuan-Kun, and YU Ming-Xun
The ordered three-dimensional photonic crystals with infrared photonic band gap was prepared from 3.87 μm polystyrene (PS) microspheres by vertical substrate self-assembly method. It is found that the microspheres exhibit the highest order and least defect when the ratio of ethanol to water in the suspension is 2∶8 (V%The ordered three-dimensional photonic crystals with infrared photonic band gap was prepared from 3.87 μm polystyrene (PS) microspheres by vertical substrate self-assembly method. It is found that the microspheres exhibit the highest order and least defect when the ratio of ethanol to water in the suspension is 2∶8 (V%). Increasing the concentration of microspheres in the suspension, the number of stacking layers and the thickness of the photonic crystals were improved. Then the reflection and radiation properties of the photonic crystals with different ordering degree in the infrared band were characterized. The results reveal that higher ordering degree and larger ordered area of the microspheres lead to higher reflectivity and lower emissivity of the photonic crystals, thereby effectively inhibiting the infrared radiation of the aim surface..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 739 (2017)
Simultaneous, real-time, chromatic polarimetric imaging technology with full-polarization-state detection
JU Hai-Juan, LIANG Jian, ZHANG Wen-Fei, BAI Zhao-Feng, REN Li-Yong, and QU En-Shi
As a new kind of optical imaging technology, polarimetric imaging can efficiently increase the detection dimension of the information by detecting the polarization properties of the optical wave. This is useful for obtaining the target information comprehensively and accurately. Firstly, the method of polarization imagAs a new kind of optical imaging technology, polarimetric imaging can efficiently increase the detection dimension of the information by detecting the polarization properties of the optical wave. This is useful for obtaining the target information comprehensively and accurately. Firstly, the method of polarization imaging detecting was introduced and the typical polarization imaging systems are reviewed in this paper. Then, based on Stokes Vector, a simultaneous, real-time, division of aperture chromatic polarimetric imaging camera with full-polarization-state detection was introduced in detail. Finally, the experimental results of full polarimetric imaging and polarimetric dehazing imaging using this camera were demonstrated. The experimental results indicate that the polarimetric imaging technology of full polarization states simultaneous detecting has obvious advantages on developing the detecting distance and acquiring the detail features, so it can provide important supplement for modern optical imaging system..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 744 (2017)
Wavelet transform of Gaussian progressive decomposition method for full-waveform LiDAR data
YANG Xue-Bo, WANG Cheng, XI Xiao-Huan, TIAN Jian-Lin, NIE Sheng, and ZHU Xiao-Xiao
Gaussian decomposition is a commonly used method for waveform analysis, which is a key post-processing step for the applications of large footprint LiDAR data. However, it usually fails to detect the overlapping pulses of large-footprint waveform data. Therefore, a Gaussian progressive decomposition method based on wavGaussian decomposition is a commonly used method for waveform analysis, which is a key post-processing step for the applications of large footprint LiDAR data. However, it usually fails to detect the overlapping pulses of large-footprint waveform data. Therefore, a Gaussian progressive decomposition method based on wavelet transform was proposed in this study to address this issue and applied to Ice, Cloud, and land Elevation Satellite / Geoscience Laser Altimeter System (ICESat/GLAS) data. The new proposed method mainly consists of three key steps. First, the wavelet transform was adopted to detect the target features and estimate the component feature parameters, then the Gaussian model was established to optimize the feature parameters. Second, a new component was added if the fitting accuracy didn’t meet the requirements. Finally, waveform decomposition based on wavelet transform was completed until no more new components were added. Additionally, a comparison experiment between the new proposed method and the Gaussian decomposition method based on inflection point was also conducted to verify the reliability of the new proposed algorithm. Experiment results indicated that our new proposed algorithm can detect twice targets as many as the method based on inflection point, and effectively decompose the targets from overlapping waveforms due to high fitting accuracy of above 98%..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 749 (2017)
Spatial uniformity of organic thin films based on reflectance difference microscopy
HUO Shu-Chun, HU Chun-Guang, SHEN Wan-Fu, LI Yan-Ning, and HU Xiao-Tang
Organic thin-film semiconductor devices have important applications in the fields of microelectronics and optoelectronics. The film quality is one of the key factors affecting the device performance such as the uniformity of film spatial distribution. This parameter was studied by analyzing the reflectance difference mOrganic thin-film semiconductor devices have important applications in the fields of microelectronics and optoelectronics. The film quality is one of the key factors affecting the device performance such as the uniformity of film spatial distribution. This parameter was studied by analyzing the reflectance difference maps of pentacene thin film grown on an anisotropic substrate which were measured by reflectance difference microscopy..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 756 (2017)
Metal ridge-triangular semiconductor of mixed surface plasma waveguide
LI Zhi-Quan, YUE Zhong, BAI Lan-Di, LIU Tong-Lei, FENG Dan-Dan, GU Er-Dan, and LI Wen-Chao
A novel hybrid surface plasmon waveguide structure based on metal ridge-triangular semiconductors is proposed. The numerical simulation and analysis of the waveguide structure are carried out based on the finite element method. Also, the electric field distribution, transmission length, normalized mode field area as weA novel hybrid surface plasmon waveguide structure based on metal ridge-triangular semiconductors is proposed. The numerical simulation and analysis of the waveguide structure are carried out based on the finite element method. Also, the electric field distribution, transmission length, normalized mode field area as well as quality factor of the structure are considered here. Finally, the results show that: at the operating wavelength of 1550 nm, by optimizing the parameters, its effective mode field area is up to 0.00193 λ2, the transmission length is 37.7 μm, and the quality factor is 4853, besides, the structure has lower loss. Compared with the metal plate hybrid waveguide structure, the design of the structure has a greater quality factor and stronger light field limiting ability, what's more, the waveguide comprehensive performed better. This kind of waveguide structure has a wide application prospect in the fields of micro-nano photonics, optoelectronic communication and optical information storage..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 761 (2017)
Quantitative analysis based on infrared polarization characteristic of black body
CHEN Wei-Li, WU Jing-Li, XU Wen-Bin, LI Jun-Wei, WANG Shu-Hua, DONG Yan-Bing, and YAO Shi-Lei
Based on the bidirectional reflectance distribution function model, the paper establishes infrared radiation transmission equation of object surface. We deduce the mathematical model with respect to a lot of factors of the degree of polarization. Aim at the infection of circumstance factors, a lot of experiment of the Based on the bidirectional reflectance distribution function model, the paper establishes infrared radiation transmission equation of object surface. We deduce the mathematical model with respect to a lot of factors of the degree of polarization. Aim at the infection of circumstance factors, a lot of experiment of the infrared polarization and the infrared hyper-spectral polarization imaging about different material and standard blackbody were developed. The result show that the infrared degree of polarization of blackbody is not relate to waved length, and the method of infrared polarization quantitative analysis is put forward that is based on the infrared polarization characteristics of standard blackbody..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 767 (2017)
Quantitative detection of point target with different sampling systems
LIU Feng-Yi, HU Yong, RAO Peng, KUANG Ding-Bo, and GONG Cai-Lan
This paper focuses on quantitative detection performance for point target with single-sampling and over-sampling systems. An imaging chain simulation model based on the sampling model of sub-pixel is presented, which depicts detection for targets with various heights and sizes under given resolution conditions. Single-This paper focuses on quantitative detection performance for point target with single-sampling and over-sampling systems. An imaging chain simulation model based on the sampling model of sub-pixel is presented, which depicts detection for targets with various heights and sizes under given resolution conditions. Single-sampling and over-sampling with the same IFOV, over-sampling of two times IFOV were taken into account. Performance of the three sampling systems was compared and analyzed from the following four aspects: target signal’s acquisition capability, background signal and clutter level, detectability and measurement characteristics. Results show that over-sampling of the same IFOV is conductive to the acquisition of the target signal and has better detectability, while that of two times IFOV suppresses target signal and goes against detecting target with low SCR. The over-sampling has inhibitory effect on background signal and clutter while collects apparently superfluous radiation intensity that has to be corrected..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 776 (2017)
A new method on estimating object emissivity by using four times measuring and principle of temperature compensation
ZHANG Ren-Hua, MI Su-Juan, TIAN Jing, LI Zhao-Liang, SU Hong-Bo, HAO Gui-Bin, JIANG Bo, and LIU Su-Hua
A "two times thermal irradiance and four times measuring method" was proposed to measure the surface emissivity of any object. Compared with the previous methods, the proposed method can completely eliminate the interference of the lens and cavity walls of the sensor to measure accurately the irradiance of thA "two times thermal irradiance and four times measuring method" was proposed to measure the surface emissivity of any object. Compared with the previous methods, the proposed method can completely eliminate the interference of the lens and cavity walls of the sensor to measure accurately the irradiance of the observed object, implying its ability to improve the accuracy of surface emissivity measurement and making the equipment of emissivity measurement portable. The designed 1000+w/m2 strong heat radiation source considerably improved the signal to noise ratio of the equipment. To compensate the warming effect of the measured object under the strong heat radiation source, we proposed a universal expression to solve the emissivity in the non-isothermal system and a "Process Method" to reduce warming. The comparison of three measurement results showed that the proposed method outperformed the others..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 783 (2017)
2DEG characteristics of HEMT THz detector
LI Jin-Lun, CUI Shao-Hui, XU Jian-Xing, YUAN Ye, SU Xiang-Bin, NI Hai-Qiao, and NIU Zhi-Chuan
The 2DEG samples of GaAs/AlxGa1-xAs was prepared by adopting MBE. In the process of sample preparation, by changing the constituent content of Al and the thickness of the isolation layer and comparing the body doping with the delta doping, we perform the Hall test under the condition of 300 K the migration rate of roomThe 2DEG samples of GaAs/AlxGa1-xAs was prepared by adopting MBE. In the process of sample preparation, by changing the constituent content of Al and the thickness of the isolation layer and comparing the body doping with the delta doping, we perform the Hall test under the condition of 300 K the migration rate of room temperature is 7.205×103 cm2/Vs and the carrier concentration is the open groove structure of 2DEG of GaAs/AlxGa1-xAs, which is 1.787×1012/cm3. Besides, the software of Mathematica is adopted to respectively calculate the THz response rates of GaAs-based HEMT structures with different channel widths under the temperature of 300 K and 77 K, which have provided the references for the research and preparation of HEMT THz detectors..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 790 (2017)
Correction method of zero path difference position
FENG Xuan, GUO Qiang, HAN Chang-Pei, and ZOU Yao-Pu
The Geostationary Interferometric Infrared Sounder (GIIRS) on board FY-4A is a Michelson interferometer infrared sounder. The interferogram is sampled at discrete points. The zero path difference (ZPD), which is the peak of the interferogram, is not sampled. This effectively shifts the interferogram and adds a linear pThe Geostationary Interferometric Infrared Sounder (GIIRS) on board FY-4A is a Michelson interferometer infrared sounder. The interferogram is sampled at discrete points. The zero path difference (ZPD), which is the peak of the interferogram, is not sampled. This effectively shifts the interferogram and adds a linear phase to the spectrum. A linear regression on the residual phase of the calibrated spectrum will reveal the shift. This method has been used in the interferogram signal processing of the GIIRS, and has obtained a better results..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 795 (2017)
Multi-frame image coded aperture snapshot spectral image technology
LIU Shi-Jie, ZHANG Xu-Dong, ZHANG Yue, LI Chun-Lai, and WANG Jian-Yu
Based on dual-disperser coded aperture snapshot spectral imaging(DD-CASSI)system, method using multiple sample image (Multi Frame-DD-CASSI ) was put forward to increase the sampling rate. And a new math model was put forward to realize spectral compression in 3-D data cube. The system makes full use of spectra’s correlBased on dual-disperser coded aperture snapshot spectral imaging(DD-CASSI)system, method using multiple sample image (Multi Frame-DD-CASSI ) was put forward to increase the sampling rate. And a new math model was put forward to realize spectral compression in 3-D data cube. The system makes full use of spectra’s correlation, and 0.99 spectral correlation fitting and 40db image peak signal noise were achieved with 32 frames of sample images..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 799 (2017)
[in Chinese]
[in Chinese]
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 805 (2017)
[in Chinese]
[in Chinese]
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 6, 816 (2017)
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