Towards a portable Raman spectrometer using a concave grating and a time-gated CMOS SPAD | Zendy

ZhiYun Li | Zendy; M. Jamal Deen | Zendy

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Towards a portable Raman spectrometer using a concave grating and a time-gated CMOS SPAD

Author(s) -

ZhiYun Li,

M. Jamal Deen

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.018736

Subject(s) - raman spectroscopy , optics , materials science , spectrometer , optoelectronics , grating , laser , avalanche photodiode , raman scattering , photon counting , detector , physics

A low-cost, compact Raman spectrometer suitable for the on-line water monitoring applications is explored. A custom-designed concave grating for wavelength selection was fabricated and tested. The detection of the Raman signal is accomplished with a time-gated single photon avalanche diode (TG-SPAD). A fixed gate window of 3.5ns is designed and applied to the TG-SPAD. The temporal resolution of the SPAD was ~60ps when tested with a 7ps, 532nm solid-state laser. To test the efficiency of the gating in fluorescence signal suppression, different detection windows (3ns-0.25ns) within the 3.5ns gate window are used to measure the Raman spectra of Rhodamine B. Strong Raman peaks are resolved with this low-cost system.

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