Title :
Plasmonic-Enhanced Photodetectors for Focal Plane Arrays
Author :
Lee, S.C. ; Krishna, S. ; Brueck, S.R.J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of New Mexico, Albuquerque, NM, USA
fDate :
7/15/2011 12:00:00 AM
Abstract :
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.
Keywords :
III-V semiconductors; focal planes; gold; indium compounds; infrared detectors; optical fabrication; optical films; passivation; photodetectors; plasmonics; quantum dots; 2D square array; GaAs; InAs-Au-GaAs; corrugated metal surface; focal plane arrays; heavily doped contact layer; passivated thick film; plasmonic-enhanced photodetectors; quantum-dot infrared photodetector; size 1.1 mum; substrate-side illumination; surface plasma waves; temperature 77 K; Absorption; Detectors; Gallium arsenide; Gold; Magnetic materials; Photonic crystals; Focal plane array; quantum-dot infrared photodetector (QDIP); surface plasma wave;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2135341
