Optomechanical transduction and characterization of a silica microsphere pendulum via evanescent light

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Optomechanical transduction and characterization of a silica microsphere pendulum via evanescent light

Madugani, Ramgopal; Yang, Yong; Ward, Jonathan M.; Le, Vu H.; Nic Chormaic, Síle
Date: 2015
Copyright: © 2015 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Madugani, R., Ward, J. M., Le, V. H. and Chormaic, S. N. (2015) 'Optomechanical transduction and characterization of a silica microsphere pendulum via evanescent light', Applied Physics Letters, 106(24), pp. 241101 and may be found at http://aip.scitation.org/doi/abs/10.1063/1.4922637
Related: http://aip.scitation.org/doi/abs/10.1063/1.4922637
Citation: Madugani, R., Ward, J. M., Le, V. H. and Chormaic, S. N. (2015) 'Optomechanical transduction and characterization of a silica microsphere pendulum via evanescent light', Applied Physics Letters, 106(24), pp. 241101. doi: 10.1063/1.4922637
Published Version: 10.1063/1.4922637

Abstract:

Dissipative optomechanics has some advantages in cooling compared to the conventional dispersion dominated systems. Here, we study the optical response of a cantilever-like, silica, microsphere pendulum, evanescently coupled to a fiber taper. In a whispering gallery mode resonator, the cavity mode and motion of the pendulum result in both dispersive and dissipative optomechanical interactions. This unique mechanism leads to an experimentally observable, asymmetric response function of the transduction spectrum, which can be explained using coupled-mode theory. The optomechanical transduction and its relationship to the external coupling gap are investigated, and we show that the experimental behavior is in good agreement with the theoretical predictions. A deep understanding of this mechanism is necessary to explore trapping and cooling in dissipative optomechanical systems. (C) 2015 AIP Publishing LLC.

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