Contents
2022
Volume: 43 Issue 3
7 Article(s)
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Optical Mechanism of Annealed Mn1.95Co0.77Ni0.28O4 Thin Films in Near and Mid Infrared Waveband
Fei ZHANG, and Jing-qi JU
The ellipsometric data in near and mid infrared waveband are fitted by double Lorentz and effective medium approximation (EMA) dispersion models for annealed Mn1.95Co0.77Ni0.28O4thin films. By comparing the tested conductivity under direct current (DC) voltage with the calculated conductivity at low frequency (ω→0), itThe ellipsometric data in near and mid infrared waveband are fitted by double Lorentz and effective medium approximation (EMA) dispersion models for annealed Mn1.95Co0.77Ni0.28O4thin films. By comparing the tested conductivity under direct current (DC) voltage with the calculated conductivity at low frequency (ω→0), it is found that A oscillator mainly generates conduction current and B oscillator mainly generates displacement current. For Mn1.95Co0.77Ni0.28O4thin films, the lattice resonance absorption will gradually be replaced by the electron resonance absorption with increasing annealing temperature. Both the refractive index n and extinction coefficient k of the annealed samples are determined by the annealing process..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 1 (2022)
Development of Photoelectric Detectors Based on Low-Dimensional Materials
Jia-jia NIU, Ming LIU, Wei-rong XING, Qian LI, and Wei-lin SHE
In order to more effectively seize new resources, various countries are committed to space exploration such as aviation, aerospace and ocean to occupy the most advantageous position. The optoelectronic system plays a decisive role in this process. For the core component photodetector, the basic structure and characteriIn order to more effectively seize new resources, various countries are committed to space exploration such as aviation, aerospace and ocean to occupy the most advantageous position. The optoelectronic system plays a decisive role in this process. For the core component photodetector, the basic structure and characteristics of new detector materials such as quantum dots, graphene, transition metal sulfides and black phosphorus are introduced. Their development status is described, and future development directions and application fields are predicted..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 8 (2022)
Research on Stress Reduction Method of Infrared Focal Plane Detector Chip
Hong-yu ZHANG, and Sen LIU
The 1280×1024 infrared focal plane detector is taken as an example, and 3D visualization entity simulation software is used to establish a 3D model including cold finger parts, ceramic frame and detector chip in this paper. The simulation comparison is conducted by using ANSYS simulation software (only the sphericThe 1280×1024 infrared focal plane detector is taken as an example, and 3D visualization entity simulation software is used to establish a 3D model including cold finger parts, ceramic frame and detector chip in this paper. The simulation comparison is conducted by using ANSYS simulation software (only the spherical cold platform structure is different from the conventional cold platform, and other parts are the same). The results show that the spherical cold platform can achieve lower thermal stress and smaller thermal deformation of the chip by increasing the area of the contact surface between the cold platform and the refrigerator. And the reliability of the detector chip can be improved by this way..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 16 (2022)
Development and Military Application of Spaceborne Hyperspectral Imager
Ming-qi GAO, Long-long XIAO, and Yu-bo WANG
With the development of space technology, spaceborne hyperspectral imaging technology is becoming mature and widely used. In this paper, the basic concepts and characteristics of hyperspectral imaging are expounded firstly. Then the development status of spaceborne hyperspectral imaging in the past 20 years is systematWith the development of space technology, spaceborne hyperspectral imaging technology is becoming mature and widely used. In this paper, the basic concepts and characteristics of hyperspectral imaging are expounded firstly. Then the development status of spaceborne hyperspectral imaging in the past 20 years is systematically introduced from domestic and foreign perspectives. The main performance index and related remote sensing applications are analyzed as well. Finally, the military applications of spaceborne hyperspectral technology in battlefield environment reconnaissance, marine military action monitoring, battlefield meteorological environment assessment and missile early warning detection are analyzed and summarized, and briefly explained by examples..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 22 (2022)
Polarization-Insensitive Metamaterial Terahertz Broadband Absorber Based on Multilayer Structure
Hao LU, and He-ming CHEN
In order to solve the problem of complex design of broadband absorber, a polarization insensitive metamaterial THz broadband absorber with simple structure and excellent absorption performance is proposed. The absorber adopts symmetrical structure design, which is based on the three-layer structure of metal layer-mediuIn order to solve the problem of complex design of broadband absorber, a polarization insensitive metamaterial THz broadband absorber with simple structure and excellent absorption performance is proposed. The absorber adopts symmetrical structure design, which is based on the three-layer structure of metal layer-medium layer-metal layer. Two circular metal sheets of different sizes are embedded in the medium layer to form a multilayer structure. Frequency domain finite element method (FEM) is used to analyze the broadband absorption rate, polarization sensitivity and incident angle of the absorber. The simulation results show that the absorber can achieve wide band absorption of 5.86~7 THz, and the absorption bandwidth is 1.14 THz. The absorption rate is more than 95% within the bandwidth, and it is not sensitive to the polarization of vertically incident electromagnetic wave. And it still maintains broadband absorption within a certain incidence angle. The absorber has a simple structure design and excellent performance, which has important application value in terahertz imaging and electromagnetic stealth fields..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 31 (2022)
Development of FORUM Payloads in ESA
Yan LU, Mei-jun WANG, Yi-lun GE, and Chen XU
In 2019，the FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) mission has been selected by the ESA as the ninth mission Earth Explorer in the Living Planet Programme. It will measure the emission spectrum of the Earth′s stratosphere and troposphere in the spectral range of 100 to 1600 cm-1(i.e.6.25 mIn 2019，the FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) mission has been selected by the ESA as the ninth mission Earth Explorer in the Living Planet Programme. It will measure the emission spectrum of the Earth′s stratosphere and troposphere in the spectral range of 100 to 1600 cm-1(i.e.6.25 m to 100 m). The FORUM space segment consists of a single satellite carrying two optical instruments: the FORUM Sounding Instrument (FSI) and the FORUM Embedded Imager (FEI). The primary optical instrument is an infrared-atmospheric-sounder Fourier transform spectrometer. During the FORUM phase A/B1, studies have been led by Airbus Defence and Space (UK) and Thales Alenia Space Ltd (UK) as mission prime contractors, with concept A and concept B respectively. This paper will describe the design and key technology research progress of concept B of the FSI and FEI..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 3, 40 (2022)
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