Use of an unintensified charge-coupled device detector for low-light-level Raman spectroscopy

C. A. Murray, S. B. Dierker

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Spontaneous Raman scattering from adsorbates on surfaces is a powerful vibrational spectroscopy technique that is due to the very large frequency range and high resolution currently possible with visible lasers and spectrometers. Because of the extremely low Raman cross sections of nonresonant molecules, one must use either some sort of signal-enhancement technique or long integrations using multichannel detection in order to have monolayer sensitivity. We have used a backthinned, unintensified, liquid-nitrogen-cooled charge-coupled device (CCD) detector to obtain high-quality multichannel unenhanced Raman scattering spectra from organic monolayers on surfaces. This system has roughly a factor-of-10 greater sensitivity for very low-light-level visible excitation Raman spectra than intensified multichannel detectors currently on the market. A description of our detection system is given along with a comparison with other commercially available multichannel detectors suitable for low-light-level visible Raman spectroscopy. We discuss the advantages and disadvantages of using CCD’s, the special problems that one encounters in their use as Raman detectors, and our methods for overcoming these problems. Prospects for the future use of CCD’s for low-light-level Raman spectroscopy will also be discussed.

Original languageEnglish (US)
Pages (from-to)2151-2159
Number of pages9
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume3
Issue number12
DOIs
StatePublished - Jan 1 1986
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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