Plasmonic nanoslit array enhanced metal-semiconductor-metal optical detectors
Date
2012-01-09
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Source Title
IEEE Photonics Technology Letters
Print ISSN
1041-1135
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Publisher
Institute of Electrical and Electronics Engineers
Volume
24
Issue
7
Pages
548 - 550
Language
English
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Abstract
Metallic nanoslit arrays integrated on germanium metal-semiconductor-metal photodetectors show many folds of absorption enhancement for transverse-magnetic polarization in the telecommunication C-band. Such high enhancement is attributed to resonant interference of surface plasmon modes at the metal-semiconductor interface. Horizontal surface plasmon modes were reported earlier to inhibit photodetector performance. We computationally show, however, that horizontal modes enhance the efficiency of surface devices despite reducing transmitted light in the far field.
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Keywords
Photodetectors , Plasmons , Silicon germanium , Absorption enhancement , Far field , Horizontal surfaces , Metal semiconductor interface , Metal semiconductor metal , Metal semiconductor metal photodetector , Metallic nanoslit arrays , Nanoslits , Optical detectors , Plasmonic , Silicon germanium , Surface device , Surface plasmon modes , Transmitted light , Germanium , Photodetectors , Plasmons