Proof of concept of fiber dispersed Raman spectroscopy using superconducting nanowire single-photon detectors

Due to its high molecular specificity, Raman spectroscopy is a well-established analytical tool. Usually the inelastically scattered Raman light is spectrally dispersed by a spectrometer. Here, we present an alternative method, using an optical fiber as dispersive element. As the group velocity with...

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Bibliographic Details
Published in:Optics express 2015-02, Vol.23 (4), p.5078-5090
Main Authors: Toussaint, Julia, Dochow, Sebastian, Latka, Ines, Lukic, Aleksandar, May, Torsten, Meyer, Hans-Georg, Il'in, Konstantin, Siegel, Michael, Popp, Jürgen
Format: Article
Language:English
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Summary:Due to its high molecular specificity, Raman spectroscopy is a well-established analytical tool. Usually the inelastically scattered Raman light is spectrally dispersed by a spectrometer. Here, we present an alternative method, using an optical fiber as dispersive element. As the group velocity within the fiber is wavelength-dependent, different Raman bands arrive at different times at the detector. In combination with time-correlated single-photon counting, Raman spectra can be measured in the time domain. As detector we implemented a Superconducting Nanowire Single-Photon Detector (SNSPD), which possesses a timing accuracy of about 20 ps. Within this contribution we show first results of Raman spectra measured in the time domain using gradient index fibers of varying length.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.005078