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Interaction of a nano-object with a high-Q microcavity: From frequency tuning to the Purcell effect

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1 Author(s)
Sandoghdar, V. ; Lab. of Phys. Chem., ETH Zurich, Zurich, Switzerland

In this paper, the author discusses both theoretically and experimentally, the conditions for which the tip can tune the resonance frequency of a microcavity without introducing a substantial line broadening. In particular, whispering-gallery modes in silica microspheres and modes of photonic crystal cavities were investigated and show that a dielectric nano-object acts as a dipolar Rayleigh scatterer, where the ratio of its polarizability to the cavity mode volume determines its influence on the cavity spectrum. It was concluded that a suitable tip can be used for mechanical tuning of a microresonator. However, it was also shown that scanning near-field optical microscope (SNOM) can be invasive and one has to take into account the tip influence on very high-Q modes.

Published in:

Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on

Date of Conference:

14-19 June 2009

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