25 February 2014 Single-beam trapping using laser beams focused by low and high numerical apertures: angular spectrum approach
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Proceedings Volume 8999, Complex Light and Optical Forces VIII; 899904 (2014) https://doi.org/10.1117/12.2039094
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Single beam optical tweezers hold particles behind the focal plane due to the highly focused laser beam. However, even moderately focused beams may stably con ne particles of high refractive index contrast and sizes up to half wavelength. This is caused by the fact that the light structure near focus is complex even for such moderately focused beams. The intensity pro le consists of several axial oscillations as well as off-axis lobes or rings which enhance trapping. Moreover, side lobes provide another multiple trapping sites for small sized particles. The properties of these traps will be analyzed theoretically by means of Generalized Lorenz-Mie Scattering theory.
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Martin Siler, Martin Siler, Oto Brzobohaty, Oto Brzobohaty, Petr Jakl, Petr Jakl, Vitezslav Karasek, Vitezslav Karasek, Pavel Zemanek, Pavel Zemanek, } "Single-beam trapping using laser beams focused by low and high numerical apertures: angular spectrum approach ", Proc. SPIE 8999, Complex Light and Optical Forces VIII, 899904 (25 February 2014); doi: 10.1117/12.2039094; https://doi.org/10.1117/12.2039094
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