Journals >Chinese Optics Letters
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2010
Volume: 8 Issue 8
24 Article(s)
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Research Article
Satellite retrieval of inherent optical properties in the turbid waters of the Yellow Sea and the East China Sea
Tingwei Cui, Jie Zhang, Junwu Tang, Yi Ma, and Song Qing
In situ-satellite match-ups of radiometric data are established in the turbid waters of the Yellow Sea and the East China Sea. Inherent optical properties (IOPs) are retrieved by match-up radiometric data and multi-band quasi-analytical algorithm (QAA). By comparing in situ spectra-retrieved IOPs with the satellite oneIn situ-satellite match-ups of radiometric data are established in the turbid waters of the Yellow Sea and the East China Sea. Inherent optical properties (IOPs) are retrieved by match-up radiometric data and multi-band quasi-analytical algorithm (QAA). By comparing in situ spectra-retrieved IOPs with the satellite ones of moderate resolution imaging spectroradiometer (MODIS) and medium resolution imaging spectrometer (MERIS), the accuracy of satellite-derived IOPs is quantified. The median of the absolute percentage difference is found to be approximately 20% for the total absorption coefficient a<sub>t</sub>(\lambda) at green and blue-green bands, and 30% for particulate material backscattering coefficient b<sub>bp</sub>(\lambda) throughout the visible bands. The spatial pattern and temporal variability of IOPs along the eastern coast of China are clarified based on satellite images and the QAA model..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 721 (2010)
Mobile Rayleigh Doppler wind lidar based on double-edge technique
Lei Tang, Zhifeng Shu, Jihui Dong1, Guocheng Wang, Yongtao Wang, Wenjing Xu, Dongdong Hu, Tingdi Chen, Xiankang Dou, Dongsong Sun, and Hyunki Cha
We describe a mobile molecular Doppler wind lidar (DWL) based on double-edge technique for wind measurement of altitudes ranging from 10 to 40 km. A triple Fabry-Perot etalon is employed as a frequency discriminator to determine the Doppler shift proportional to the wind velocity. The lidar operates at 355 nm with a 45We describe a mobile molecular Doppler wind lidar (DWL) based on double-edge technique for wind measurement of altitudes ranging from 10 to 40 km. A triple Fabry-Perot etalon is employed as a frequency discriminator to determine the Doppler shift proportional to the wind velocity. The lidar operates at 355 nm with a 45-cm-aperture telescope and a matching azimuth-over-elevation scanner that provides full hemispherical pointing. To guarantee wind accuracy, a single servo loop is used to monitor the outgoing laser frequency to remove inaccuracies due to the frequency drift of the laser or the etalon. The standard deviation of the outgoing laser frequency drift is 6.18 MHz and the corresponding velocity error is 1.11 m/s. The wind profiles measured by the DWL are in good agreement with the results of the wind profile radar (WPR). Evaluation is achieved by comparing at altitudes from 2 to 8 km. The relative error of horizontal wind speed is from 0.8 to 1.8 m/s in the compared ranges. The wind accuracy is less than 6 m/s at 40 km and 3 m/s at 10 km..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 726 (2010)
Retrieving aerosol backscattering coefficient for short range lidar using parameter selection at reference point
Zongming Tao, Qingze Zhang, Ke′e Yuan, Decheng Wu, Kaifa Cao, Shunxing Hu, and Huanling Hu
A new method is proposed based on the analysis of lidar equation which selects aerosol backscatter ratio at a reference point for short range lidar in data processing. Simulation computation and experimental comparison results show that this method is reasonable and feasible. The method is applied to short range lidarsA new method is proposed based on the analysis of lidar equation which selects aerosol backscatter ratio at a reference point for short range lidar in data processing. Simulation computation and experimental comparison results show that this method is reasonable and feasible. The method is applied to short range lidars, such as atmospheric monitoring lidar-2 (AML-2) and micro-pulse lidar (MPL)..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 732 (2010)
Cold atom space clock with counter-propagating atoms
Desheng Lv, Bin Wang, Tang Li, and Liang Liu
We discuss the feasibility of realizing a cold atom space clock with counter-propagating cold atoms in microgravity. The design of the space clock is based on an atomic beam clock with Ramsey cavity, except that magneto-optical trap (MOT) is placed at each side. Cold atoms are launched simultaneously from the MOTs at bWe discuss the feasibility of realizing a cold atom space clock with counter-propagating cold atoms in microgravity. The design of the space clock is based on an atomic beam clock with Ramsey cavity, except that magneto-optical trap (MOT) is placed at each side. Cold atoms are launched simultaneously from the MOTs at both sides of the clock and they move at the counter-direction towards each other. The velocity of the launched atoms is precisely controlled to Ramsauer-Townsend resonance so that no additional collision frequency shift takes place. Such configuration can efficiently cancel the frequency shift resulting from cavity phase shift and increase the signal-to-noise ratio (SNR)..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 735 (2010)
Effect of polarization on efficiency of volume Bragg grating filter
Haobin Zheng, Yanlan He, Jichun Tan, Daoyi Ding, Yixing Liu, Xiaoyan Yu, Guangwei Zheng, Xiao Wang, and Xiaodong Wang
Diffraction efficiency of volume Bragg grating, whose period is in the same order as the incident wavelength, is related to the polarization direction of the incident linear polarized beam. When two linearly polarized recording beams with the same polarization direction are used for recording volume Bragg gratings in aDiffraction efficiency of volume Bragg grating, whose period is in the same order as the incident wavelength, is related to the polarization direction of the incident linear polarized beam. When two linearly polarized recording beams with the same polarization direction are used for recording volume Bragg gratings in a photopolymer with diffusion amplification, the azimuth of polarization of the reconstruction beam influences the diffraction efficiency of the grating. When the probe beam is linearly polarized and oriented orthogonally to the grating vectors, the ±1-order diffraction beams are also linearly polarized with polarization direction parallel to that of the probe beam. According to the results, a two-dimensional nonspatial optical filter consisting of the volume Bragg gratings would achieve significantly higher efficiency..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 738 (2010)
Stable error-free single channel 160-Gb/s OTDM 100-km transmission via high-precision dispersion management
Nan Jia, Tangjun Li, Kangping Zhong, Muguang Wang, Ming Chen, Dan Lu, Wanjing Peng, and Jianfeng Chi
A single channel with a 160-Gb/s optical time-division-multiplexing (OTDM) transmission over 100 km is fabricated. With the help of 500-GHz optical sampling oscilloscopes, the fiber length is adjusted to the order of 10 m, which corresponds to the accuracy of 0.4 ps for the dispersion compensation. The dispersion map iA single channel with a 160-Gb/s optical time-division-multiplexing (OTDM) transmission over 100 km is fabricated. With the help of 500-GHz optical sampling oscilloscopes, the fiber length is adjusted to the order of 10 m, which corresponds to the accuracy of 0.4 ps for the dispersion compensation. The dispersion map is optimized for the 100-km transmission link. A completely error-free transmission with the power penalty of 3.6 dB is achieved for 2 h without using forward error correction..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 741 (2010)
Hybrid WDMA/OCDM system with the capability of encoding multiple wavelength channels by employing one encoder and one corresponding optical code
He Chen, Shilin Xiao, Min Zhu, Jie Shi, and Meihua Bi
A hybrid wavelength division multiple access (WDMA)/optical code division multiplexing (OCDM) system is proposed, where the optical code is not the same as the address of every optical network unit (ONU); rather, the code is a virtual fiber of hybrid passive optical network (PON). To our knowledge, this is the first reA hybrid wavelength division multiple access (WDMA)/optical code division multiplexing (OCDM) system is proposed, where the optical code is not the same as the address of every optical network unit (ONU); rather, the code is a virtual fiber of hybrid passive optical network (PON). To our knowledge, this is the first report analyzing a single encoder/decoder with a single corresponding optical code being exploited to encode/decode multiple wavelength signals simultaneously. This system enables OCDM to become transparent to ONU so that the existing wavelength division multiplexing (WDM) PON can be upgraded. Thus, redesigning the optical line terminal and ONU can be easily accomplished, and greatly decreasing the number of encoder/decoder becomes possible. In experiment, we only employ two encoder/decoder pairs to combine two WDM-PONs in one fiber. Simulation results confirm the feasibility of the proposed system..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 745 (2010)
A novel polarization channel drop filter based on two-dimensional photonic crystals
Hongliang Ren, Yali Qin, Kai Liu, Zhefu Wu, Weisheng Hu, Chun Jiang, and Yaohui Jin
A novel polarization channel drop filter (PCDF) based on two-dimensional (2D) photonic crystals (PCs) is presented. It consists of two line defect waveguides and two point defect micro-cavities. In the line-defect waveguides, the transverse-electric (TE) and transverse-magnetic (TM) polarization lights are guided usingA novel polarization channel drop filter (PCDF) based on two-dimensional (2D) photonic crystals (PCs) is presented. It consists of two line defect waveguides and two point defect micro-cavities. In the line-defect waveguides, the transverse-electric (TE) and transverse-magnetic (TM) polarization lights are guided using photonic band-gap and total internal reflection effect, respectively. The light at the resonant frequency for TE polarization can be transferred from one waveguide to the other using the proposed system. Compared with the existing four-port PCDF based on PCs, the three-port structure can realize a multi-channel wavelength system of PCDF more easily and can be an essential device in future polarization wavelength division multiplexing (PWDM) systems..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 749 (2010)
Key module for a novel all-optical network coding scheme
Zhijian Qu, Yuefeng Ji, Lin Bai, Yongmei Sun, and Jia Fu
We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks. A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme. The module is a key hardware component in realizing the proposed scheme. The working principle and the We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks. A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme. The module is a key hardware component in realizing the proposed scheme. The working principle and the experimental results of the module are also presented. Experimental results show that the function of the module is sufficient in satisfying the requirements of the proposed network coding scheme..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 753 (2010)
Sub-nanosecond silicon-on-insulator optical micro-ring switch with low crosstalk
Xi Xiao, Haihua Xu, Liang Zhou, Zhiyong Li, Yuntao Li, Yude Yu, and Jinzhong Yu
We demonstrate a sub-nanosecond electro-optical switch with low crosstalk in a silicon-on-insulator (SOI) dual-coupled micro-ring embedded with p-i-n diodes. A crosstalk of -23 dB is obtained in the 20 \mu m-radius micro-ring with the well-designing asymmetric dual-coupling structure. By optimizations of the doping proWe demonstrate a sub-nanosecond electro-optical switch with low crosstalk in a silicon-on-insulator (SOI) dual-coupled micro-ring embedded with p-i-n diodes. A crosstalk of -23 dB is obtained in the 20 \mu m-radius micro-ring with the well-designing asymmetric dual-coupling structure. By optimizations of the doping profiles and the fabrication processes, the sub-nanosecond switch-on/off time of <400 ps is finally realized under an electrical pre-emphasized driving signal. This compact and fast-response micro-ring switch, which can be fabricated by complementary metal oxide semiconductor (CMOS) compatible technologies, have enormous potential in optical interconnects of multicore networks-on-chip..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 757 (2010)
Wavelength division demultiplexing by photonic crystal waveguides with asymmetric corrugated surfaces
Cuilian Liu, Zhixiang Tang, Huiming Dong, Dongmo Song, Zhaoming Luo, Xiaohui Ling, and Shiming Cao
We propose a new type of wavelength division demultiplexer composed of a photonic crystal waveguide with asymmetric corrugated exit surface. The focus displacement for different symmetric corrugated surfaces is relative to the intensity of the excited surface mode. By systematically investigating the effects of the parWe propose a new type of wavelength division demultiplexer composed of a photonic crystal waveguide with asymmetric corrugated exit surface. The focus displacement for different symmetric corrugated surfaces is relative to the intensity of the excited surface mode. By systematically investigating the effects of the parameters of the corrugated surface on the focus shift, we demonstrate an on-axis focus by a photonic crystal waveguide with an asymmetric corrugated exit surface at a specific wavelength. The precise equivalences of surface modes at each side of the exit surface are broken. Thus, for the light source with other wavelengths, the emerging beams are off-axis focused at different directions, similar to the function of a wavelength division demultiplexer..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 761 (2010)
Amplified spontaneous emission and power amplification in high-power DF laser systems
Xing Chen, Wenguang Liu, and Zongfu Jiang
Amplified spontaneous emission (ASE) always occurs in high-power DF laser systems with master oscillator-power amplifier (MOPA) configuration. ASE not only reduces the energy extraction efficiency of the laser system, but also negatively influences its heat management. The interaction between the ASE flux and the coherAmplified spontaneous emission (ASE) always occurs in high-power DF laser systems with master oscillator-power amplifier (MOPA) configuration. ASE not only reduces the energy extraction efficiency of the laser system, but also negatively influences its heat management. The interaction between the ASE flux and the coherent laser flux, as well as the effect of ASE on cuboid DF amplifiers, is studied using a finite difference method and an iterative arithmetic. In addition, the influence of ASE on coherent laser amplification is discussed in detail..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 764 (2010)
Air-breathing mode laser propulsion with a long-pulse TE CO2 laser
Jing Chen, Rongqing Tan, Jin Wu, Yuantian Lu, Cheng Xu, and Yufeng Zhu
Air-breathing mode laser propulsion experiment with a long-pulse transversely excited (TE) CO<sub>2</sub> laser is carried out, and its ignition problem is solved with the ignition needle of lightcraft. Owing to the ignition needle, an order of magnitude reduction in the ignition threshold is demonstrated. Air-breathing mode laser propulsion experiment with a long-pulse transversely excited (TE) CO<sub>2</sub> laser is carried out, and its ignition problem is solved with the ignition needle of lightcraft. Owing to the ignition needle, an order of magnitude reduction in the ignition threshold is demonstrated. The result is compared with previous study. The momentum coupling coefficient is also measured in the experiment and its dependence upon laser pulse energy (6-14 J) and pulse width (20, 32, and 40 \mu s) is discussed..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 771 (2010)
VCSEL with reticular electrode and larger emitting aperture and its optoelectronic characteristics
Yuan Feng, Lifeng Hou, Yongqin Hao, Changling Yan, Yingjie Zhao, Yuxia Wang, and Jingchang Zhong
The enlargement of the emitting aperture is usually one of the important methods of increasing verticalcavity surface-emitting laser (VCSEL) optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem aThe enlargement of the emitting aperture is usually one of the important methods of increasing verticalcavity surface-emitting laser (VCSEL) optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem and to increase VCSEL output power, as well as to improve its thermal characteristics, we develop a new type of injected VCSEL with a larger aperture and a reticular electrode, where the conventional circular injection electrode of the P side is turned into a reticular one, and the heat sink is on the N side. The tests of the new VCSEL show an improvement in homogeneity in not only the injected current but also the emission intensity. The optical output power is also considerably increased, and the device optoelectronic performance is improved..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 773 (2010)
Study on laser-generated Lamb waves propagation in viscoelastic and anisotropic plate
Hongxiang Sun, Baiqiang Xu, Guidong Xu, and Chenguang Xu
The propagation characteristics of laser-generated Lamb waves in thin composite plates are theoretically studied. Taking the anisotropic and viscoelastic properties of the composite material into account, the finite element models for simulating laser-generated Lamb waves in the composite material are established in thThe propagation characteristics of laser-generated Lamb waves in thin composite plates are theoretically studied. Taking the anisotropic and viscoelastic properties of the composite material into account, the finite element models for simulating laser-generated Lamb waves in the composite material are established in the frequency domain. Numerical results are calculated in purely elastic and viscoelastic transversely isotropic plates, respectively. The effects of the anisotropic and viscoelastic properties on the propagation of Lamb waves are analyzed in detail. The numerical results exhibit that the features of the laser-generated Lamb wave, including attenuation, velocity, frequency, and the dispersive nature, have a close relationship with the anisotropic and viscoelastic properties of the material..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 776 (2010)
Spectroscopic characteristics of Yb3+:LiLa(WO4)2 crystal
Xinyang Huang
The spectroscopic characterization and fluorescence dynamics of Yb<sup>3+</sup>:LiLa(WO<sub>4</sub>)<sub>2</sub> crystal are investigated. The Yb<sup>3+</sup>:LiLa(WO<sub>4</sub>)<sub>2</sub> crystal exhibits a broad absorption and emission spectraThe spectroscopic characterization and fluorescence dynamics of Yb<sup>3+</sup>:LiLa(WO<sub>4</sub>)<sub>2</sub> crystal are investigated. The Yb<sup>3+</sup>:LiLa(WO<sub>4</sub>)<sub>2</sub> crystal exhibits a broad absorption and emission spectral bands, large absorption and emission cross sections, and moderate fluorescence lifetime. Blue light emission around 480 nm is observed at 10 K and is demonstrated through cooperative upconversion from the deexcitation of excited Yb<sup>3+</sup>-Yb<sup>3+</sup> pairs..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 780 (2010)
Monitoring photo-thermal response and collagen remodeling of mouse skin with multiphoton microscopy
Shulian Wu, Hui Li, and Xiaoman Zhang
Two-photon excitation fluorescence (TPEF) and second-harmonic generation (SHG) are detected through multiphoton microscopy (MPM). The major signals have the potential to monitor the process of tissue changes. TPEF and SHG are used to monitor the skin photo-thermal response to irradiation with intense pulsed light sourcTwo-photon excitation fluorescence (TPEF) and second-harmonic generation (SHG) are detected through multiphoton microscopy (MPM). The major signals have the potential to monitor the process of tissue changes. TPEF and SHG are used to monitor the skin photo-thermal response to irradiation with intense pulsed light sources (\lambda is in the range of 560?1200 nm) and trace the process of skin remodeling in vivo at different time intervals. TPEF intensity is nearly unchanged at different time intervals after irradiation, whereas SHG intensity changes considerably. The results reveal the photo-thermal effect of nonablative light sources and the process of collagen remodeling at the sub-micron level..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 784 (2010)
An experimental investigation on two-dimensional shape-based diffuse optical tomography
Pingqiao Ruan, Feng Gao, Fang Yang, and Huijuan Zhao
A two-dimensional (2D) shape-based approach of image reconstruction using a boundary element method is developed for diffuse optical tomography (DOT). The experimental validation uses a four-channel time-correlated single photon counting (TCSPC) system for detection and an intensity data-type for image reconstruction. A two-dimensional (2D) shape-based approach of image reconstruction using a boundary element method is developed for diffuse optical tomography (DOT). The experimental validation uses a four-channel time-correlated single photon counting (TCSPC) system for detection and an intensity data-type for image reconstruction. The optical and geometric parameters are simultaneously recovered using a difference imaging scheme. Results demonstrate that the proposed DOT modality is a promising methodology of in vivo reconstruction of the optical structures of tissues..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 787 (2010)
Rotary dynamics of solitons in radially periodic optical lattices
Keya Zhou, Zhongyi Guo, and Shutian Liu
We investigate the dynamics of strongly localized solitons trapped in remote troughs of radially periodic lattices with Kerr-type self-focusing nonlinearity. The rotary motion of solitons is found to be more stable for larger nonlinear wavenumbers, lower rotating velocity, and shorter radius of the trapping troughs. WhWe investigate the dynamics of strongly localized solitons trapped in remote troughs of radially periodic lattices with Kerr-type self-focusing nonlinearity. The rotary motion of solitons is found to be more stable for larger nonlinear wavenumbers, lower rotating velocity, and shorter radius of the trapping troughs. When the lattice is shrunk or expanded upon propagation, the solitons can be trapped in the original trough and move outward or inward, with their rotating linear velocity inversely proportional to the radius of the trapping troughs..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 791 (2010)
Enhancement of nonlinear susceptibility in a four-level tripod scheme
Xiang′an Yan, Liqiang Wang, Baoyin Yin, and Jianping Song
We propose a scheme for the enhancement of nonlinear susceptibility in a four-level tripod-type atomic system in the presence of a microwave field. With a microwave field, nonlinear susceptibility can be enhanced. Nonlinearity can also be ulteriorly enhanced by controlling the coupling field under the optimal intensityWe propose a scheme for the enhancement of nonlinear susceptibility in a four-level tripod-type atomic system in the presence of a microwave field. With a microwave field, nonlinear susceptibility can be enhanced. Nonlinearity can also be ulteriorly enhanced by controlling the coupling field under the optimal intensity of the microwave field. The physical mechanism of the obtained giant nonlinear susceptibility is mainly based on interactions between microwave field and coupling fields. We present a physical understanding of our numerical results using a dressed-state approach and an analytical explanation..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 795 (2010)
Experiments and analyses of a new type optical system for computed radiography
Meng Zheng, Qibo Feng, Zhan Gao, Shuangyun Shao, and Keqing Ding
A new high-performance laser scanning system is designed. In this system, a scanning arm consisting of a pentagonal prism and a scanning object lens is used to replace the traditional F \theta lens, and a circular imaging plate transmission mechanism is specially designed in order to meet the requirement of the scanninA new high-performance laser scanning system is designed. In this system, a scanning arm consisting of a pentagonal prism and a scanning object lens is used to replace the traditional F \theta lens, and a circular imaging plate transmission mechanism is specially designed in order to meet the requirement of the scanning arm. At the same time, the stimulation fluorescence can be obtained by the scanning arm. Some main factors that influence the spatial resolution and the performance of the laser scanner system are analyzed, and the analysis results are presented, which is helpful for further optimization design of the system. Experimental results indicate that the images obtained by the system have good visual effects and can meet the requirements of industrial inspection..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 800 (2010)
A novel method to calibrate LiNbO3-based polarization controllers
Lixia Xi, Xiaoguang Zhang, Xianfeng Tang, Xuan Weng, and Feng Tian
A fast and reliable method to calibrate LiNbO3-based polarization controllers (PCs) presented theoretically and experimentally. Particle swarm optimization (PSO) algorithm is used as an adaptive searching algorithm. Experimental results show that PSO algorithm is powerful in calibrating LiNbO3-based multistage PCs. OnlA fast and reliable method to calibrate LiNbO3-based polarization controllers (PCs) presented theoretically and experimentally. Particle swarm optimization (PSO) algorithm is used as an adaptive searching algorithm. Experimental results show that PSO algorithm is powerful in calibrating LiNbO3-based multistage PCs. Only less than one minute is spent for all stages of the PC to be calibrated thoroughly..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 804 (2010)
Electromagnetic transmission in configurations composed of two one-dimensional perfect electric conductor metal gratings
Ji Xu, Chen Cheng, Zhu Zheng, Jing Chen, Qiang Bai, Cong Liu, and Huitian Wang
We study transmission properties in configurations composed of two single metal gratings with different thicknesses. Choosing the perfect electric conductor excludes the influence of intrinsic material dispersion on transmission behaviors; and as such, we aim to reveal the contribution of geometric dispersion to electrWe study transmission properties in configurations composed of two single metal gratings with different thicknesses. Choosing the perfect electric conductor excludes the influence of intrinsic material dispersion on transmission behaviors; and as such, we aim to reveal the contribution of geometric dispersion to electromagnetic transmission. Transmission suppression line, instead of a transmission suppression point, is discovered, denoting the curve of the wavelength versus the interval or the lateral displacement between the two single gratings when the transmission suppression appears. A simplified model is proposed to comprehend the underlying physics of this special phenomenon..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 807 (2010)
Hyperspectral feature recognition based on kernel PCA and relational perspective map
Hongjun Su, and Yehua Sheng
A novel joint kernel principal component analysis (PCA) and relational perspective map (RPM) method called KPmapper is proposed for hyperspectral dimensionality reduction and spectral feature recognition. Kernel PCA is used to analyze hyperspectral data so that the major information corresponding to features can be betA novel joint kernel principal component analysis (PCA) and relational perspective map (RPM) method called KPmapper is proposed for hyperspectral dimensionality reduction and spectral feature recognition. Kernel PCA is used to analyze hyperspectral data so that the major information corresponding to features can be better extracted. RPM is used to visualize hyperspectral data through two-dimensional (2D) maps, and it is an efficient approach to discover regularities and extract information by partitioning the data into pieces and mapping them onto a 2D space. The experimental results prove that the KPmapper algorithm can effectively obtain the intrinsic features in nonlinear high dimensional data. It is useful and impressing for dimensionality reduction and spectral feature recognition..
Chinese Optics Letters
- Publication Date: Jul. 07, 2021
- Vol. 8, Issue 8, 811 (2010)
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