title: Short-wavelength infrared tuneable filters on HgCdTe photoconductors.
abstract: 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.
authors.forename: Martin
authors.initials: M
authors.lastname: Soh
authors.forename: T
authors.initials: T
authors.lastname: Nguyen
authors.forename: K K
authors.initials: KK
authors.lastname: Silva
authors.forename: R
authors.initials: R
authors.lastname: Westerhout
authors.forename: J
authors.initials: J
authors.lastname: Antoszewski
authors.forename: A
authors.initials: A
authors.lastname: Keating
authors.forename: N
authors.initials: N
authors.lastname: Savvides
authors.forename: C
authors.initials: C
authors.lastname: Musca
authors.forename: J
authors.initials: J
authors.lastname: Dell
authors.forename: L
authors.initials: L
authors.lastname: Faraone