Radiation-pressure-induced nonlinearity in microdroplets

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Peng ZhangYong Xu

Abstract

High quality (Q) factor whispering gallery modes (WGMs) can induce nonlinear effects in liquid droplets through mechanisms such as radiation pressure, Kerr nonlinearity, and thermal effects. However, such nonlinear effects, especially those due to radiation pressure, have yet to be thoroughly investigated and compared in the literature. In this study, we present an analytical approach that can exactly calculate the droplet deformation induced by the radiation pressure. The accuracy of the analytical approach is confirmed through numerical analyses based on the boundary element method. We show that the nonlinear optofluidic effect induced by the radiation pressure is stronger than the Kerr effect and the thermal effect under a large variety of realistic conditions. Using liquids with ultralow and experimentally attainable interfacial tension, we further confirm the prediction that it may only take a few photons to produce measurable WGM resonance shift through radiation-pressure-induced droplet deformation.

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Citations

Sep 19, 2019·Proceedings of the National Academy of Sciences of the United States of America·Aidan RaffertyThomas C Preston
Feb 22, 2017·Reports on Progress in Physics·D McGloin
Jul 15, 2016·Physical Review. E·Peng ZhangYong Xu
May 15, 2020·Optics Express·Aram LeeSunghwan Jung

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