Open AccessShort-wavelength infrared tuneable filters on HgCdTe photoconductors
Author(s) -
Martin T. K. Soh,
T. Nguyen,
Dilusha Silva,
R.J. Westerhout,
J. Antoszewski,
Adrian Keating,
N. Savvides,
Charles Musca,
John Dell,
Lorenzo Faraone
Publication year - 2005
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.009683
Subject(s) - responsivity , materials science , optoelectronics , optics , infrared , mercury cadmium telluride , full width at half maximum , fabry–pérot interferometer , wavelength , photodetector , carrier lifetime , physics , silicon
The design, micro-fabrication, and electronic and optical performance of a tuneable short-wavelength infrared Fabry-Pérot microresonator on a mercury cadmium telluride photoconductor is presented. The maximum processing temperature of 125 degrees C has negligible effect on the electronic and optical performance of photoconductor test structures. Maximum responsivity, effective carrier lifetime and detectivity are 60x103 VW-1, 2x10-5 s and 8x1010 cmHz1/2W-1, respectively. The maximum effective carrier lifetime and specific detectivity are in good agreement with the theoretical maxima. Uncooled device operation is possible since responsivity is observed not to improve with thermo-electric cooling. Spectral tuning of the micro-filters is demonstrated over the wavelength range 1.7 to 2.2 mum using drive voltages up to 8 V, with the full-width-half-maximum of the resonance approximately 100 nm. Membrane deflection can be up to 40% of the cavity width.