title: Raman hyperspectral imaging spectrometer utilizing crystalline colloidal array photonic crystal diffraction.
abstract: We fabricated a novel hyperspectral Raman imaging spectrometer that, for the first time, uses a photonic-crystal wavelength-selecting device to select a narrow-wavelength spectral interval. The photonic crystal consists of an array of highly charged, monodisperse polystyrene particles that self-assemble into a face-centered cubic crystal. The photonic crystal Bragg-diffracts a narrow spectral interval that can be tuned by altering the incident angle of collimated Raman scattered light. Our prototype spectrometer diffracts a ~200 cm(-1) interval of the 488 nm excited visible Raman spectrum of Teflon. This enabled us to select a close-lying triplet of Teflon Raman bands. We imaged the Teflon surface by focusing this narrow region onto a charge-coupled device to create a Raman image of the sample surface that spectrally details the chemical composition.
authors.affiliation: University of Pittsburgh, Department of Chemistry, 219 Parkman Avenue, Chevron Science Center, Room 701, Pittsburgh, PA 15260 USA.
authors.forename: Kyle T
authors.initials: KT
authors.lastname: Hufziger
authors.affiliation: University of Pittsburgh, Department of Chemistry, 219 Parkman Avenue, Chevron Science Center, Room 701, Pittsburgh, PA 15260 USA.
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Bykov
authors.affiliation: University of Pittsburgh, Department of Chemistry, 219 Parkman Avenue, Chevron Science Center, Room 701, Pittsburgh, PA 15260 USA.
authors.forename: Sanford A
authors.initials: SA
authors.lastname: Asher