New resonant cavity-enhanced absorber structures for mid-infrared detector applications |
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| Authors: | Moshe Zohar Mark Auslender Lorenzo Faraone Shlomo Hava |
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| Institution: | 1. Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, P.O. Box 653, 84105, Beer Sheva, Israel
2. School of Electrical, Electronic and Computer Engineering, The University of Western Australia, M018 35 Stirling Highway, Crawley, 6009, WA, Australia
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| Abstract: | A new dielectric Fabry–Perot cavity was designed for a resonant enhancing optical absorption by a thin absorber layer embedded into the cavity. In this cavity, the front mirror is a subwavelength grating with ~ 100% retroreflection. For a HgCdTe absorber in a matching cavity of the new type, the design is shown to meet the combined challenges of increasing the absorbing efficiency of the entire device up to ~ 100?% and reducing its size and overall complexity, compared to a conventional resonant cavity enhanced HgCdTe absorber, while maintaining a fairly good tolerance against the grating’s fabrication errors. |
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