Fluorescence suppression within Raman spectroscopy using annular beam excitation

I. G. Cormack, M. Mazilu, K. Dholakia, C. S. Herrington

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This letter demonstrates how the use of an annular beam can significantly reduce the detected fluorescence from optical components within a Raman spectroscopic arrangement. The fluorescence from the excitation beam has a reduced generation and collection efficiency compared to the standard Gaussian beam. Crucially, the Raman signal from the annular beam is collected through the dark center of the excitation light field. This robust and simple technique may be immediately applied to all Raman configurations and may find broader applicability for any spectroscopic methodology which utilizes a high numerical aperture lens and requires the detected fluorescence to be suppressed.

Original languageEnglish
Article number023903
JournalApplied Physics Letters
Volume91
Issue number2
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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