IEEE Photonics Technology Letters · 2011 · 29 citations · 9 references
EngineeringElectrical EngineeringMaterials ScienceOptoelectronicsPhotonicsSemiconductor DevicesInfrared DetectorsPhotodetectorsPlasmonic MaterialsPlasmonicsQuantum DotsSemiconductor SurfacesElectron Plasma WavesFocal Plane ArraysInfrared PhotodetectorsPhotodetectionPlasmon-enhanced SemiconductorsPlasmonic PhotodetectionQuantum Dot DevicesQuantum Dot Photodetectors
Plasmonic enhancement of a quantum-dot infrared photodetector (QDIP) using a corrugated metal surface (CMS) that is fully compatible with conventional focal plane array manufacturing is demonstrated. A CMS consisting of a 2.5-μm period, 2-D square array of 1.1-μ m-high GaAs circular posts passivated with a thick Au film is fabricated into the heavily doped, top GaAs contact layer of an InAs QDIP. For substrate-side illumination, the CMS exhibits strong coupling to surface plasma waves bound to the Au/GaAs interface providing enhancement of the QDIP. At 77 K, the CMS-processed QDIP exhibits up to ~15-fold detectivity enhancement compared with the original detector.
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Si Nano-Photodiode with a Surface Plasmon Antenna
Tsutomu Ishi, Junichi Fujikata, Kikuo Makita et al. · Japanese Journal of Applied Physics · 2005 · 334 citations