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- Title
High-Efficiency Long-Wave Infrared Quantum Well Photodetector Based on Cascaded Dielectric Metasurfaces with Almost 100% Absorption.
- Authors
Ge, Zihui; Cheng, Bo; Zhai, Kunpeng; Song, Guofeng
- Abstract
Quantum well infrared photodetectors (QWIPs) are popular due to their following advantages: low cost, maturity of manufacturing, high uniformity, ease of wavelength adjustment, resistance to heat, and resistance to ionizing radiation. However, their low absorption efficiency due to their unique anisotropic absorption properties and ohmic loss of the metal grating severely limit their further adoption. We cleverly used cascaded dielectric metasurfaces to replace the traditional single-layer metal grating, which increased the absorption efficiency to near the upper limit of 100%. By analyzing the near-field profile of the electric field of the miniaturized device, we found that the upper grating, QWIP, and lower grating formed a high-efficiency FP cavity with a strong photon localization capability, allowing the microdevice to effectively achieve 99.3% absorption. In addition, QWIPs with cascade gratings can be incorporated into a polarimeter, allowing for the comprehensive detection of linear polarization information at a wavelength of 14 μ m through rational rotations. Our proposed double-layer grating coupling method can be considered a technology that can effectively address the low-absorption problem associated with QWIPs.
- Subjects
LINEAR polarization; ANDERSON localization; QUANTUM wells; IONIZING radiation; ELECTRIC fields
- Publication
Crystals (2073-4352), 2024, Vol 14, Issue 12, p1088
- ISSN
2073-4352
- Publication type
Academic Journal
- DOI
10.3390/cryst14121088