An Uncooled LWIR-Detector with LSPR Enhancement and Selective Narrow Absorption
Journal
IEEE Photonics Technology Letters
Journal Volume
30
Journal Issue
13
Pages
1206-1209
Date Issued
2018
Author(s)
Abstract
An uncooled plasmonic infrared photodetector with selective narrow absorption band in long-wave-infrared was demonstrated. The hydrogenated amorphous silicon (a-Si:H) with high temperature coefficient of resistance characteristic was adopted as a detection layer in the plasmonic photodetector. A tri-layer gold/a-Si:H/gold arrangement with metallic gold strip was designed to sustain localized surface plasmon resonances (LSPRs). By altering the metallic linewidth and the dielectric thickness, the LSPRs can be adjusted freely. Therefore, the incoming infrared with specific wavelength corresponding to LSPRs will heat up the cavity directly, leading to the reduction of a-Si:H resistance along the current path and the signal would be detected. The optical and electrical characteristics of the photodetector were studied. The responsivity and perpendicular photoresponse ratio without suspended structure was enhanced by LSP resonances and directly heat up process. © 1989-2012 IEEE.
Subjects
LSP; mid-infrared; narrow absorption band; photodetector; room temperature
Other Subjects
Absorption; Amorphous silicon; Bandwidth; Gold; Heat resistance; Infrared devices; Photodetectors; Photons; Plasmonics; Plasmons; Surface plasmon resonance; Temperature; Temperature measurement; Dielectric thickness; Electrical characteristic; High temperature coefficient; Hydrogenated amorphous silicon (a-Si:H); Infrared photodetector; Localized surface plasmon resonance; Midinfrared; Strips; Infrared radiation
Type
journal article