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Larger golden nanoparticles grow into several preferred forms. Some of those may be easily approximated by ellipsoids. In this paper we examine the rotational dynamics of spheroidal particles in an optical trap comprising counter-propagating Gaussian beams of opposing helicity. Isolated spheroids undergo continuous rotation with frequencies determined by their size and aspect ratio. We study the rotational frequencies and stability of these golden nano-particles theoretically by the means of T-Matrix.
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Martin Šiler, Lukáš Chvátal, Oto Brzobohatý, Alejandro V. Arzola, Petr Jákl, Stephen H. Simpson, Pavel Zemánek, "Rotational behavior of oblate golden nanoparticles in circularly polarized dual beam optical trap," Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 95481E (25 August 2015); https://doi.org/10.1117/12.2188159