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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper QFA8

Spectral diffusion of single impurity centers in crystals

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Abstract

Single-molecule detection and spectroscopy in solids has the potential for direct observation of the microscopic physics and chemistry of defects without multicenter averaging. Initial observations of the optical absorption spectra of a single pentacene molecule in p-terphenyl crystals achieved signal-to-noise ratios (SNR's) of 3-5 in a 1-Hz bandwidth and required intensities at the sample above the saturation intensity. Careful noise analysis of our detectors showed that little improvement in SNR could be expected with an absorption technique unless simple and reliable sources of squeezed light were available. Recent advances in fluorescence- excitation spectroscopy have removed this SNR limitation.3

© 1991 Optical Society of America

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