Journals >Journal of Infrared and Millimeter Waves
Contents
2002
Volume: 21 Issue 5
17 Article(s)
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Research Article
QUANTUM MECHANICAL MODEL AND SIMULATION OFGaAs/AlGaAs QUANTUM WELL INFRARED PHOTO-DETECTOR-Ⅰ OPTICAL ASPECTS
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A complete quantum mechanical model for GaAs/AlGaAs quantum well infrared photodetectors(QWIPs) is presented here. The model consisted of four parts: (1) Starting with the description of the electromagnetic field of the infrared radiation in the QWIP, effective component of the vector potential along the QWIP growth diA complete quantum mechanical model for GaAs/AlGaAs quantum well infrared photodetectors(QWIPs) is presented here. The model consisted of four parts: (1) Starting with the description of the electromagnetic field of the infrared radiation in the QWIP, effective component of the vector potential <| A z |> along the QWIP growth direction ( z axis) due to the optical diffraction grating was calculated. (2) From the wave transmissions and the occupations of the electronic states, it was discussed that the dark current in the QWIP is determined by the drift diffusion current of carriers thermally excited from the ground sublevel in the quantum well to extended states above the barrier. (3) The photocurrent was investigated by the optical transition (absorption coefficient between the ground state to excited states due to the nonzero <| A z |> ). (4) By studying the inter diffusion of the Al atoms across the GaAs?AlGaAs heterointerfaces,the mobility of the drift diffusion carriers in the excited s.
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 5, 321 (2002)
ASimilarity Measurement for Affine Invariance Retrieval Based on Synergetic Neural Nets (SNN)
[in Chinese], [in Chinese], and [in Chinese]
A new concept of control parameter, order vector, based on SNN was proposed. More specifically, its associate properties for image retrieval was studied. Based on the properties, an efficient element based affine invariance similarity measurement was proposed for retrieval of trademark images. The experiments indicate A new concept of control parameter, order vector, based on SNN was proposed. More specifically, its associate properties for image retrieval was studied. Based on the properties, an efficient element based affine invariance similarity measurement was proposed for retrieval of trademark images. The experiments indicate that the retrieval method is good in against noisy and occluded images, and the method has affine invariance in translated, rotated and scaled images..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 5, 327 (2002)
STUDY OF PHOTOREFLECTANCE SPECTROSCOPY IN SEMICONDUCTOR Cd1-xMnxTe/CdTe SUPERLATTICES WITH HIGH COMPOSITIONS
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Photoreflectance spectra of Cd 1- x Mn x Te?CdTe superlattices with high compositions x =0.4,0.8 were carried out at room temperature and liquid nitrogen temperature. The samples were grown by molecular beam epitaxy (MBE) technique. Exciton transitions of heavy and light holes related to 11H,22H,33H and 11L were observPhotoreflectance spectra of Cd 1- x Mn x Te?CdTe superlattices with high compositions x =0.4,0.8 were carried out at room temperature and liquid nitrogen temperature. The samples were grown by molecular beam epitaxy (MBE) technique. Exciton transitions of heavy and light holes related to 11H,22H,33H and 11L were observed. After taking into consideration the strain induced and quantum confinement effects, the theoretical calculations are in very good agreement with our photo reflectance measurement results except 33H of x =0.8. Photoluminescence spectra were also performed at room temperature and low temperature in order to compare with our photoreflectance results..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 332 (2002)
PHOTON LOCALIZATION OF RANDOM MEDIA CONTAINING ABSORPTIVE SCATTERERS IN MID-INFRARED REGION
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Photon localization of random media containing anomalous dispersive dielectric materials and metal scatterers, was investigated theoretically. Based on the Mie scattering theory in mid infrared region at low concentration(10%), photon localization of random media with some anomalous dispersive dielectric spheres as scaPhoton localization of random media containing anomalous dispersive dielectric materials and metal scatterers, was investigated theoretically. Based on the Mie scattering theory in mid infrared region at low concentration(10%), photon localization of random media with some anomalous dispersive dielectric spheres as scatterers, was realized, and strong photon localization was appeared in reststrahelm band freqances. Investigations of random optical media with metal scatterers was finished, and discovered that scattered behaviours of different metals in mid infrared region at different freqences were very similar. The results show that it is almost impossible that photon localization in the whole mid infrared region..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 5, 337 (2002)
EFFECT OF Si ION IMPLANTATION IN GaN AND ITS THERMAL ANNEALING TEMPERATURE ON YELLOW LUMINESCENCE
[in Chinese], [in Chinese], and [in Chinese]
The influence of Si ion implantation in GaN and post implantation thermal annealing on yellow luminescence(YL) by using two types of GaN samples with strong YL and without YL were studied. As the thermal annealing temperatures increased, the YL intensity and the intensity ratio of YL to near band edge(BE) emission ( I The influence of Si ion implantation in GaN and post implantation thermal annealing on yellow luminescence(YL) by using two types of GaN samples with strong YL and without YL were studied. As the thermal annealing temperatures increased, the YL intensity and the intensity ratio of YL to near band edge(BE) emission ( I Y? I BE ) for both types of implanted GaN samples enhanced. After Si ion implantation and post implantation thermal annealing, the YL of the GaN sample with strong YL decreased markedly, while that of the GaN sample without YL increased markedly. These experimental results show that the ion implantation together with appropriate post annealing can produce YL related deep acceptor defects, and can increase YL intensity, besides, the GaN surface can adsorb two kinds of point defects, one is caused from ion implantation, another is native and related to YL. This adsorption action of GaN surface becomes strong as ion implantation dose increases..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 342 (2002)
SURFACE STICKING COEFFICIENT OF As IN MOLECULAR BEAM EPITAXY OF HgCdTe
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Behaviors of As incorporation into HgCdTe in molecular beam epitaxy were studied and reported by using a SIMS(Secondary Ion Mass Spectrometry) quantitative analysis. It was found that the surface sticking coefficient of As was very low, and had a strong correlation with the Hg incorporation. For single crystal HgCdTe eBehaviors of As incorporation into HgCdTe in molecular beam epitaxy were studied and reported by using a SIMS(Secondary Ion Mass Spectrometry) quantitative analysis. It was found that the surface sticking coefficient of As was very low, and had a strong correlation with the Hg incorporation. For single crystal HgCdTe epilayers, the sticking coefficient was as low as 3×10 -4 at the growth temperature of 170℃. At this temperature, the good surface morphology of HgCdTe epilayers was obtained by optimization growth conditions, and the As concentration was well controlled by the As oven temperature..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 347 (2002)
EFFECT OF THERMAL LATTICE VIBRATION ON SELF-TRAPPING ENERGY OF THE SURFACE MAGNETOPO-LARON IN SEMI-INFINITE POLAR CRYSTAL WITHIN THE MAGNETIC FIELD
[in Chinese], and [in Chinese]
The effect of thermal lattice vibration on the system in semi infinite polar crystal within the magnetic field, which is weak coupling with bulk LO phonons and strong coupling with SO phonons, were studied. An expressions for the self trapping energy of the surface magnetopolaron as a function of the depth from the cryThe effect of thermal lattice vibration on the system in semi infinite polar crystal within the magnetic field, which is weak coupling with bulk LO phonons and strong coupling with SO phonons, were studied. An expressions for the self trapping energy of the surface magnetopolaron as a function of the depth from the crystal surface, magnetic field and temperature were derived by using Huybrechts' linear combination operator and variational method. The numerical results of the self trapping energy for AgCl show that the contribution of interaction between the electron and the different branch of phonons to the self trapping energy and the it's changing with the depth from the crystal surface, magnetic field and temperature are greatly different..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 351 (2002)
REFLECTION AND TRANSMISSION OF COAXIAL WAVEGUIDE PARTIALLY FILLED WITH CHIRAL MEDIA
[in Chinese], and [in Chinese]
The reflection and transmission of coaxial waveguide partially filled with chiral media were solved by a method which combined the multimode network theory with a rigorous mode matching procedure. Equivalent radial transmission lines in the transveral cross section and multimode transmission lines in the longitudinal dThe reflection and transmission of coaxial waveguide partially filled with chiral media were solved by a method which combined the multimode network theory with a rigorous mode matching procedure. Equivalent radial transmission lines in the transveral cross section and multimode transmission lines in the longitudinal direction were introduced. The symmetrical property of the structure in the longitudinal direction was considered so that the whole analysis could be simplified. Effect of chirality and permittivity on the reflection and transmission was discussed..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 356 (2002)
RESEARCH ON DISTORTION-INVARIABLE ELECTRONIC-OPTIC HYBRID IMAGE IDENTIFICATION TECHNOLOGY
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new optoelectronic hybrid system used for automatic target recognition was described. And based on the traditional Binary Phase only Filters, a optimal Binary Phase only Filter algorithm was discussed. Using the optic digital hybrid system with the algorithm, distortion invariable target identification experiment wasA new optoelectronic hybrid system used for automatic target recognition was described. And based on the traditional Binary Phase only Filters, a optimal Binary Phase only Filter algorithm was discussed. Using the optic digital hybrid system with the algorithm, distortion invariable target identification experiment was finished. Computer simulation and quasi practicality experiment show that the system has the capability of detecting and identifying a target..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 361 (2002)
HIGH SPEED RECOGNITION SYSTEM OF PLANE INFRARED IMAGE
[in Chinese], and [in Chinese]
A high speed recognition system of plane infrared image used for missile was presented. Base on the neighborhood parallel theory, this system was adopted by parallel processing structure with multi processor, and combined parallel inputting, parallel processing, parallel storing. The neighborhood image processor was usA high speed recognition system of plane infrared image used for missile was presented. Base on the neighborhood parallel theory, this system was adopted by parallel processing structure with multi processor, and combined parallel inputting, parallel processing, parallel storing. The neighborhood image processor was used for the frame processing of the long distance image, the recognition of the target and the state of the missile target engagement could be realized. The large scale parallel digital circuit with the one detector to one processor structure was used for the near distance image, the recognition of the part of plane could be realized. This system can meet the need of real time recognition during the high speed engaging of missile and target..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 367 (2002)
IMAGE PROCESSING IN PULSE HEATING INFRARED NONDESTRUCTIVE TEST
[in Chinese], [in Chinese], and [in Chinese]
According to the peculiarity of infrared nondestructive test, image processing and analysis approach suited for that test was proposed. As two focal points, the correction problem of infrared image under non uniform heating condition, and defect separation problem of infrared image under different location contrast conAccording to the peculiarity of infrared nondestructive test, image processing and analysis approach suited for that test was proposed. As two focal points, the correction problem of infrared image under non uniform heating condition, and defect separation problem of infrared image under different location contrast condition, both were solved. The results show that both approaches can improve the evaluation ability of the infrared vision testing system, make it visual,intelligent and automatic..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 372 (2002)
STUDY ON INFRARED CHARACTERISTICS OF CITY BUILDINGS WITH SEASON CHANGES AND THEIR IMAGES
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Multi layer finite difference method and other methods were used to calculate the surface temperature changes of different parts of city buildings and their surrounding parts with time in different seasons in a year considering the effect of outer meteorological factors. Using methods of Computer Graphics, modelings anMulti layer finite difference method and other methods were used to calculate the surface temperature changes of different parts of city buildings and their surrounding parts with time in different seasons in a year considering the effect of outer meteorological factors. Using methods of Computer Graphics, modelings and realistic IR images of buildings in different seasons and at different time in a day were realized and drawn..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 377 (2002)
A MULTI-PURPOSE REAL-TIME SEQUENCE SCENE GENERATOR
[in Chinese], [in Chinese], and [in Chinese]
A multi purpose real time sequence scene generator based on PC was presented. The hardware architecture and the operation styles of the system were described in detail. The functions, performances and the typical application situations of the system were shown in this paper.A multi purpose real time sequence scene generator based on PC was presented. The hardware architecture and the operation styles of the system were described in detail. The functions, performances and the typical application situations of the system were shown in this paper..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 382 (2002)
AUTOMATIC SEGMENTATION AND RECOGNITIN OF PORTS IN HIGH RESOLUTION SAR IMAGES
[in Chinese], [in Chinese], and [in Chinese]
Based on analysis of the features of SAR images, a novel algorithm for automatic segmentation of ports in high resolution SAR images was proposed according to the idea of detecting the targets along the edges of the image. At the same time, wavelet analysis was successfully used in pre filtering, denoising and recognitBased on analysis of the features of SAR images, a novel algorithm for automatic segmentation of ports in high resolution SAR images was proposed according to the idea of detecting the targets along the edges of the image. At the same time, wavelet analysis was successfully used in pre filtering, denoising and recognition of real and false targets, and good segmentation results are thus obtained..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 385 (2002)
CHARACTERISTICS OF HIGH BRIGHTNESS InGaN-BASED WHITE LIGHT EMITTING DIODES
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
High brightness white light emitting diodes(Φ3) were fabricated by using the self produced InGaN?GaN blue LED chip and YAG:Ce 3+ fluorescence. The luminous intensity, chromaticity coordinate, I V, color temperature and color rendering index were studied. The experiment result shows that in room temperature, at forward High brightness white light emitting diodes(Φ3) were fabricated by using the self produced InGaN?GaN blue LED chip and YAG:Ce 3+ fluorescence. The luminous intensity, chromaticity coordinate, I V, color temperature and color rendering index were studied. The experiment result shows that in room temperature, at forward current 20mA, luminous intensity of the white LED is from 1.1cd to 2.3cd, when forward current is under 3.5V, the chromaticity coordinate is (0.28,0.34), and the color rendering index is about 70..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 390 (2002)
EPITAXIALLY GROWN Ba1-xSrxTiO3 THIN FILMS BY SOL-GEL TECHNIQUES AND ITS STRUCTURE AND PROPERTIES
[in Chinese], [in Chinese], and [in Chinese]
Epitaxial Ba 0.65 Sr 0.35 TiO 3 thin films were successfully deposited on Pt?MgO(100) substrates by sol gel techniques. XRD patterns demonstrated that(001) planes of BST films were mainly oriented parallel to Pt(100) and MgO(100). SEM results showed that the surface of BST thin film was smooth and free of cracks, and tEpitaxial Ba 0.65 Sr 0.35 TiO 3 thin films were successfully deposited on Pt?MgO(100) substrates by sol gel techniques. XRD patterns demonstrated that(001) planes of BST films were mainly oriented parallel to Pt(100) and MgO(100). SEM results showed that the surface of BST thin film was smooth and free of cracks, and the film thickness was 260nm. The average grain size of the films was about 48.5nm. The dielectric constant and dissipation factor for Ba 0.65 Sr 0.35 TiO 3 thin film at a frequency of 10kHz were 480 and 0.02, respectively. The temperature dependence of dielectric constant exhibited sharp Curie transitions at temperatures around 35℃. The leakage current density of a BST film on Pt?MgO was 1.5×10 -7 A?cm 2 at an applied voltage of 3V. Such epitaxial Ba 0.65 Sr 0.35 TiO 3 thin films are the excellent materials for preparing uncooled infrared focal plane arrays..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 393 (2002)
RECTANGULAR Y2O3-ZrO2 SINGLE CRYSTAL OPTICAL WAVEGUIDES FOR INFRARED LASER DELIVERY AND FIBER-OPTIC SENSING APPLICATIONS
[in Chinese], [in Chinese], and [in Chinese]
High quality Y2O3-ZrO2 single crystal rectangular waveguides were fabricated from bulky Y 2O 3 stabilized ZrO 2 single crystal by precise cut and fine polish with cross section larger than 1mm×1mm and length of 45mm～65mm. They show much better optical properties than Y 2O 3 ZrO 2 single crystal fibers grown by theHigh quality Y2O3-ZrO2 single crystal rectangular waveguides were fabricated from bulky Y 2O 3 stabilized ZrO 2 single crystal by precise cut and fine polish with cross section larger than 1mm×1mm and length of 45mm～65mm. They show much better optical properties than Y 2O 3 ZrO 2 single crystal fibers grown by the conventional LHPG system, optical losses of the waveguides are lower than 0.03dB?cm at wavelength of 900nm, the damage thresholds are 0.98 MW?cm 2 for 1.06μm Nd:YAG laser pulses, and they are able to endure temperature as higher as 2300℃. Experimental results show that these waveguides are promising for fiber optic sensing applications at temperature above 2000℃..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2002
- Vol. 21, Issue 5, 397 (2002)
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