Phys. Rev. Lett. 62, 2535–2538 (1989)Optical detection and spectroscopy of single molecules in a solidReceived 17 March 1989; published in the issue dated 22 May 1989 Using two different double-modulation techniques, we have observed the optical-absorption spectrum of single dopant molecules of pentacene in a p-terphenyl host crystal at liquid-helium temperatures. To achieve this, frequency-modulation spectroscopy was combined either with Stark or ultrasonic modulation to remove interfering background signals from residual amplitude modulation, and the number of molecules in resonance was reduced to one by operating in the wings of the inhomogeneous line. Triplet bottleneck saturation appears to be suppressed in the single-molecule regime. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.2535
DOI:
10.1103/PhysRevLett.62.2535
PACS:
78.50.-w, 33.20.Kf, 33.70.Jg
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