New resonant cavity-enhanced absorber structures for mid-infrared detector applications

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 des...

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Bibliographic Details
Published in:Optical and quantum electronics 2012-06, Vol.44 (3-5), p.95-102
Main Authors: Zohar, Moshe, Auslender, Mark, Faraone, Lorenzo, Hava, Shlomo
Format: Article
Language:English
Subjects:
Cadmium compounds
Characterization and Evaluation of Materials
Computer Communication Networks
Detectors
Devices
Electrical Engineering
Gratings (spectra)
Holes
Intermetallics
Lasers
Mercury compounds
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Tellurides
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Summary: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.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-011-9515-2