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Updated: Sep 27, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
Published on: December 29, 2015
Analysis and observation, on an atomic resonance, of the frequency shift due to the length modulation of an optical
Gaëtan Hagel1, François Nez, François Biraben
1Laboratories Kastler Brossel, Ecolé Normale Supérieure et Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris 05, France.
Abstract:
The frequency shift of the light owing to a cavity length modulation has been observed with the spectroscopy of the 1S-3S two-photon transition in hydrogen. The excitation of this transition occurs at a wavelength of 205 nm. One produces this radiation by frequency doubling a 410-nm radiation in an enhancement ring cavity. The length modulation of this cavity induces frequency shifts and a splitting of the observed 1S-3S line. We obtain a good agreement between the experiment and the theoretical analysis.
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