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Proceedings Paper

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

Paper Details

Date Published: 25 February 2014
PDF: 8 pages
Proc. SPIE 8999, Complex Light and Optical Forces VIII, 899904 (25 February 2014); doi: 10.1117/12.2039094
Show Author Affiliations
Martin Siler, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Oto Brzobohaty, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Petr Jakl, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Vitezslav Karasek, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Pavel Zemanek, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 8999:
Complex Light and Optical Forces VIII
David L. Andrews; Enrique J. Galvez; Jesper Glückstad, Editor(s)

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