Kondakci, H.E.Yaman, M.Dana, A.Bayındır, Mehmet2016-02-082016-02-0820101559-128Xhttp://hdl.handle.net/11693/22290We 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.EnglishEnergy gapSpectrometersSpontaneous emissionVolatile organic compoundsAbsorption spectrometersAnalyte moleculesBlackbody sourcesCavity layersCavity modeIR detectorIR filtersMolecular fingerprintPhotonic band-gap structuresQuarter wave stacksSpatial variationsTransmission peaksSpectrometryArticle10.1364/AO.49.0035960003-6935