Optical Detection and Spectroscopy of Single Molecules in a Solid.
Abstract
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 in the single-molecule regime. Keywords: Laser spectroscopy; Impurity absorption; Ultrasensitive detection; Single absorber effects. (MJM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 23, 1989
- Accession Number
- ADA207594
Entities
People
- L. Kador
- W. E. Moerner
Organizations
- International Business Machines Corporation (Armonk, NY)