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arXiv · 0901.0454

Whispering gallery mode enhanced optical force with resonant tunneling excitation in the Kretschmann geometry

J. J. Xiao·J. Ng·Z. F. Lin·C. T. Chan
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Abstract

The boundary element method is applied to investigate the optical forces when whispering gallery modes (WGMs) are excited by a total internally reflected wave. Such evanescent wave is particularly effective in exciting the high-$Q$ WGM, while the low angular or high radial order modes are suppressed relatively. This results in a large contrast between the forces on and off resonance, and thus allows for high size-selectivity. We fully incorporate the prism-particle interaction and found that the optical force behaves differently at different separations. Optimal separation is found which corresponds to a compromise between intensity and $Q$ factor.

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J. J. Xiao, J. Ng, Z. F. Lin, C. T. Chan. 2009-01-05. Whispering gallery mode enhanced optical force with resonant tunneling excitation in the Kretschmann geometry. https://doi.org/10.1063/1.3065024

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