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Rotational properties of micro-slabs driven by linearly-polarized light

Abstract : We study the rotational motion of objects trapped in a focused laser beam (optical tweezers). Micrometer-sized flat slabs are fabricated using two-photon photopolymerization. These objects, trapped by linearly-polarized light, tend to align parallel to the polarization plane. This alignment effect is attributed to the polarization anisotropy resulting from the object shape and we present a simple electromagnetic approach to estimate the resulting optical torque. Micro-rotors of different sizes are studied experimentally. We characterize the behavior of micro-objects when the light polarization is rotated at constant speed. Our theoretical approach gives a good prediction of how the size of micro-objects affects their rotation efficiency.
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Submitted on : Wednesday, May 25, 2016 - 10:08:03 AM
Last modification on : Thursday, December 12, 2019 - 9:48:01 AM



Chih-Lang Lin, Irène Wang, Marc Pierre, Isabelle Colombier, Chantal Andraud, et al.. Rotational properties of micro-slabs driven by linearly-polarized light. Journal of Nonlinear Optical Physics and Materials, World Scientific Publishing, 2005, 14 (03), pp.375-382. ⟨10.1142/S0218863505002815⟩. ⟨hal-01321150⟩



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