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18 March 2024 A quantum well infrared photodetector capable of distinguishing circularly polarized light operating at very long infrared wavelengths
Hengrui Jiang, Jianlin Feng, Jun Zhao, Dayuan Xiong
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Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131042C (2024) https://doi.org/10.1117/12.3022893
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China
Abstract
Traditional circular polarization detectors use natural chiral materials to distinguish circularly polarized light, but they have relatively low circular polarization extinction ratio (CPER) and light responsivity. This can be effectively improved by integrating chiral materials with detection materials. Common quantum well infrared photodetectors (QWIP) lack the ability to distinguish circularly polarized light. This paper proposes a QWIP that operates in the very long infrared wavelengths, which combines etched GaAs two-dimensional chiral metamaterials with quantum well materials, and achieves a high CPER of 42. Based on the combined effect of surface plasmon polariton (SPP) wave and waveguide resonance, the inter-subband absorption can reach 0.5 when the device is vertically illuminated with 14.2 μm right-handed circularly polarized (RCP) light, which is 15 times higher than that of the standard 45° inclined plane coupling device. At this point, the device has a high coupling efficiency of 810% . When left-handed circularly polarized (LCP) light is incident, the device cannot effectively excite the waveguide resonance effect due to destructive interference. The inter-subband absorption and the responsivity under LCP light are both lower than that of the standard device. This device can enhance RCP light and weaken LCP light, while maintaining high performance of the detector and having the ability to distinguish circularly polarized light. Compared to two-dimensional chiral metamaterials made of metal, our device using etched GaAs is simpler in the manufacturing process, cost-effective, and has a higher CPER. This device can be used for detecting greenhouse gases and thermal imaging in the 14-16 μm infrared wavelength range.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Hengrui Jiang, Jianlin Feng, Jun Zhao, and Dayuan Xiong "A quantum well infrared photodetector capable of distinguishing circularly polarized light operating at very long infrared wavelengths", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131042C (18 March 2024); https://doi.org/10.1117/12.3022893
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KEYWORDS
Light absorption
Quantum devices
Polarized light
Quantum wells
Quantum light
Quantum well infrared photodetectors
Chiral materials
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