Photon counting Raman spectroscopy: a benchmarking study vs surface plasmon enhancement

Yehong Li, Santosh Kumar, Tianhang Huo, Henry Du, Yu Ping Huang

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a single-photon counting Raman spectroscope and benchmark it against conventional and surface-enhanced Raman spectroscopy. For direct comparison without ambiguity, we use the same solutions of Rhodamine 6G and a common optical setup with either a spectrometer or an acousto-optic tunable filter, whereas the surface enhancement is realized with immobilized Ag nanoparticles. Our results find that the single photon counting significantly elevates the detection sensitivity by up to eight orders of magnitude, arriving at a comparable level of surface-enhanced Raman spectroscopy. Another significant advantage is with the time-resolving measurement, where we demonstrate time-gated and time-correlated single-photon counting with sub-nanosecond resolution. It offers insights into the samples’ transient responses and enables the isolation of Raman scattering from fluorescence signals.

Original languageEnglish
Pages (from-to)16657-16669
Number of pages13
JournalOptics Express
Volume32
Issue number10
DOIs
StatePublished - 6 May 2024

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