title: Detectivity enhancement in quantum well infrared photodetectors utilizing a photonic crystal slab resonator.
abstract: We characterize the performance of a quantum well infrared photodetector (QWIP), which is fabricated as a photonic crystal slab (PCS) resonator. The strongest resonance of the PCS is designed to coincide with the absorption peak frequency at 7.6 µm of the QWIP. To accurately characterize the detector performance, it is illuminated by using single mode mid-infrared lasers. The strong resonant absorption enhancement yields a detectivity increase of up to 20 times. This enhancement is a combined effect of increased responsivity and noise current reduction. With increasing temperature, we observe a red shift of the PCS-QWIP resonance peak of -0.055 cm(-1)/K. We attribute this effect to a refractive index change and present a model based on the revised plane wave method.
authors.affiliation: Center for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7, 1040 Vienna, Austria. stefan.kalchmair@tuwien.ac.at
authors.forename: S
authors.initials: S
authors.lastname: Kalchmair
authors.forename: R
authors.initials: R
authors.lastname: Gansch
authors.forename: S I
authors.initials: SI
authors.lastname: Ahn
authors.forename: A M
authors.initials: AM
authors.lastname: Andrews
authors.forename: H
authors.initials: H
authors.lastname: Detz
authors.forename: T
authors.initials: T
authors.lastname: Zederbauer
authors.forename: E
authors.initials: E
authors.lastname: Mujagić
authors.forename: P
authors.initials: P
authors.lastname: Reininger
authors.forename: G
authors.initials: G
authors.lastname: Lasser
authors.forename: W
authors.initials: W
authors.lastname: Schrenk
authors.forename: G
authors.initials: G
authors.lastname: Strasser
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D007834:Lasers; D010783:Photometry / Q000295:instrumentation*; D011789:Quantum Theory; D059629:Signal-To-Noise Ratio; D014159:Transducers