A time-resolved 128x128 SPAD camera for laser Raman spectroscopy

Yuki Maruyama; Jordana Blacksberg; Edoardo Charbon

doi:10.1117/12.920597

17 May 2012 A time-resolved 128x128 SPAD camera for laser Raman spectroscopy

Yuki Maruyama, Jordana Blacksberg, Edoardo Charbon

Proceedings Volume 8374, Next-Generation Spectroscopic Technologies V; 83740N (2012) https://doi.org/10.1117/12.920597
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

In this paper we present a time-gated single-photon avalanche diode (SPAD) array, the first of its kind to be integrated with a newly developed time-resolved laser Raman spectrometer. Time-resolved Raman spectra from various highly fluorescent minerals were successfully observed using our SPAD array; these spectra were obscured by an overwhelming fluorescence background when measured using a traditional continuous wave green laser. The system has photon detection efficiency (PDE) of 5 % at 5 V excess bias with on-chip microlenses. The dark count rate (DCR) of this SPAD is 1.8 kHz at 5 V excess bias. However, thanks to the nanosecond scale time-gating, noise rate per frame is effectively reduced to ~10^-3 counts at 40 kHz laser repetition rate.

Citation Download Citation

Yuki Maruyama, Jordana Blacksberg, and Edoardo Charbon "A time-resolved 128x128 SPAD camera for laser Raman spectroscopy", Proc. SPIE 8374, Next-Generation Spectroscopic Technologies V, 83740N (17 May 2012); https://doi.org/10.1117/12.920597

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