scholarly journals Perfect mid-infrared dual-band optical absorption realized by a simple lithography-free polar dielectric/metal double-layer nanostructure

2020 ◽  
Vol 28 (21) ◽  
pp. 31414
Author(s):  
Huijin Shen ◽  
Liu Yang ◽  
Yi Jin ◽  
Sailing He
Keyword(s):  
Optical Absorption ◽  
Double Layer ◽  
Dual Band ◽  
Mid Infrared ◽  
Polar Dielectric

Ambient temperature-independent dual-band mid-infrared radiation thermometry

2016 ◽  
Vol 55 (9) ◽  
pp. 2169 ◽  
Author(s):  
You Lü ◽  
Xin He ◽  
Zhong-Hui Wei ◽  
Zhi-Yuan Sun ◽  
Song-Tao Chang
Keyword(s):  
Ambient Temperature ◽  
Infrared Radiation ◽  
Radiation Thermometry ◽  
Dual Band ◽  
Mid Infrared

scholarly journals Strong mid-infrared optical absorption by supersaturated sulfur doping in silicon

2011 ◽  
Author(s):  
I. Umezu ◽  
A. Kohno ◽  
J. M. Warrender ◽  
Y. Takatori ◽  
Y. Hirao ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Mid Infrared ◽  
Sulfur Doping

scholarly journals Stacked Dual-Band Quantum Well Infrared Photodetector Based on Double-Layer Gold Disk Enhanced Local Light Field

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2695
Author(s):  
Chang Liu ◽  
Xuan Zuo ◽  
Shaohui Xu ◽  
Lianwei Wang ◽  
Dayuan Xiong
Keyword(s):  
Active Region ◽  
Quantum Well ◽  
Quantum Wells ◽  
Double Layer ◽  
Enhancement Factor ◽  
Coupling Efficiency ◽  
Dual Band ◽  
Enhancement Effect ◽  
Infrared Photodetector ◽  
Quantum Well Infrared Photodetector

We propose a stacked dual-band quantum well infrared photodetector (QWIP) integrated with a double-layer gold disk. Two 10-period quantum wells (QW) operating at different wavelengths are stacked together, and gold nano-disks are integrated on their respective surfaces. Numerical calculations by finite difference time domain (FDTD) showed that the best enhancement can be achieved at 13.2 and 11.0 µm. By integrating two metal disks, two plasmon microcavity structures can be formed with the substrate to excite localized surface plasmons (LSP) so that the vertically incident infrared light can be converted into electric field components perpendicular to the growth direction of the quantum well (EZ). The EZ electric field component can be enhanced up to 20 times compared to the incident light, and it is four times that of the traditional two-dimensional hole array (2DHA) grating. We calculated the enhancement factor and coupling efficiency of the device in the active region of the quantum well. The enhancement factor of the active region of the quantum well on the top layer remains above 25 at the wavelength of 13.2 μm, and the enhancement factor can reach a maximum of 45. Under this condition, the coupling efficiency of the device reaches 2800%. At the wavelength of 11.0 μm, the enhancement factor of the active region of the quantum well at the bottom is maintained above 6, and the maximum can reach about 16, and the coupling efficiency of the device reaches 800%. We also optimized the structural parameters and explored the influence of structural changes on the coupling efficiency. When the radius (r1, r2) of the two metal disks increases, the maximum coupling efficiency will be red-shifted as the wavelength increases. The double-layer gold disk structure we designed greatly enhances the infrared coupling of the two quantum well layers working at different wavelengths in the dual-band quantum well infrared photodetector. The structure we designed can be used in stacked dual-band quantum well infrared photodetectors, and the active regions of quantum wells working at two wavelengths can enhance the photoelectric coupling, and the enhancement effect is significant. Compared with the traditional optical coupling structure, the structure we proposed is simpler in process and has a more significant enhancement effect, which can meet the requirements of working in complex environments such as firefighting, night vision, and medical treatment.

Design of Infrared Athermal Optical System for Dual-Band with Double-Layer Harmonic Diffraction Element

2013 ◽  
Vol 33 (6) ◽  
pp. 0622004
Author(s):  
张欣婷 Zhang Xinting ◽  
安志勇 An Zhiyong
Keyword(s):  
Double Layer ◽  
Optical System ◽  
Dual Band

Analytical Model of Mid-Infrared Surface Plasmon Modes in a Cylindrical Long-Range Waveguide With Double-Layer Graphene

2017 ◽  
Vol 35 (10) ◽  
pp. 1971-1979 ◽  
Author(s):  
Jian-Ping Liu ◽  
Xiang Zhai ◽  
Fang Xie ◽  
Ling-Ling Wang ◽  
Sheng-Xuan Xia ◽  
...  
Keyword(s):  
Long Range ◽  
Analytical Model ◽  
Surface Plasmon ◽  
Double Layer ◽  
Mid Infrared ◽  
Layer Graphene ◽  
Plasmon Modes

Graphene-Based Tunable Polarization Insensitive Dual-Band Metamaterial Absorber at Mid-Infrared Frequencies

2015 ◽  
Vol 32 (6) ◽  
pp. 068101 ◽  
Author(s):  
Yu-Ping Zhang ◽  
Tong-Tong Li ◽  
Huan-Huan Lv ◽  
Xiao-Yan Huang ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Mid Infrared ◽  
Polarization Insensitive ◽  
Infrared Frequencies
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