title: Photonic bandgap infrared spectrometer.
abstract: We propose and demonstrate an infrared (IR) absorption spectrometer, made with a spatially variable photonic bandgap (PBG) structure, a blackbody source, and a simple IR detector, to identify the IR molecular fingerprints of analyte molecules. The PBG-based structure consists of thermally evaporated, IR transparent, high-refractive-index chalcogenide quarter-wave stacks (QWS) with a cavity layer. Spatial variation of the very sharp transmission peak due to the QWS cavity mode allows the structure to be used as a variable IR filter. Our proposed IR-PBG spectrometer can be used for detection and identification of volatile organic compounds.
authors.affiliation: UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
authors.forename: H Esat
authors.initials: HE
authors.lastname: Kondakci
authors.forename: Mecit
authors.initials: M
authors.lastname: Yaman
authors.forename: Aykutlu
authors.initials: A
authors.lastname: Dana
authors.forename: Mehmet
authors.initials: M
authors.lastname: Bayindir