Single-beam trapping using laser beams focused by low and  high numerical apertures: angular spectrum approach

Martin Siler; Oto Brzobohaty; Petr Jakl; Vitezslav Karasek; Pavel Zemanek

doi:10.1117/12.2039094

25 February 2014 Single-beam trapping using laser beams focused by low and high numerical apertures: angular spectrum approach

Martin Siler, Oto Brzobohaty, Petr Jakl, Vitezslav Karasek, Pavel Zemanek

Author Affiliations +

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.

Citation Download Citation

Martin Siler, Oto Brzobohaty, Petr Jakl, Vitezslav Karasek, and 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); https://doi.org/10.1117/12.2039094

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