Back to Search
Start Over
Metallic cavity quantum well infrared photodetector for filter-free SF6 gas imaging
- Source :
- Optical and Quantum Electronics. 53
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Generally, for gas imaging, narrowing the response of the camera sensor around the target gas’s absorption band would increase the imaging contrast. In this paper, A filter-free narrowband metallic cavity quantum well infrared photodetector is proposed. The metallic cavity is formed by Ti/Au film coating on the detector’s mesa. The geometry of the cavity is properly designed to sustain cavity mode resonating at 10.6 μm. With strong resonance, the absorption efficiency of the embedded quantum well active layer maintains high level (~ 74%) even with a fairly low doping concentration (~ 1 × 1017 cm−3). And the bandwidth is as narrow as 0.22 μm. A waveguide model is presented and used to analyze the metal cavity quantum well infrared photodetector, and it is found that the metal film coating on the side wall played an important role in enhancing the resonance and narrowing the spectral line width.
- Subjects :
- Waveguide (electromagnetism)
Materials science
business.industry
Physics::Optics
Resonance
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
Spectral line
Electronic, Optical and Magnetic Materials
Active layer
010309 optics
Absorption band
0103 physical sciences
Optoelectronics
Electrical and Electronic Engineering
Image sensor
0210 nano-technology
business
Quantum well infrared photodetector
Quantum well
Subjects
Details
- ISSN :
- 1572817X and 03068919
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Optical and Quantum Electronics
- Accession number :
- edsair.doi...........1a20ca7b23ca29ac345c578f1d8c7b41