Optical trapping in secondary maxima of focused laser beam

0446044 - ÚPT 2016 RIV GB eng J - Journal Article
Šiler, Martin - Zemánek, Pavel
Optical trapping in secondary maxima of focused laser beam.
Journal of Quantitative Spectroscopy and Radiative Transfer. Roč. 162, SI (2015), s. 114-121. ISSN 0022-4073. E-ISSN 1879-1352
R&D Projects: GA ČR GPP205/12/P868; GA MŠMT ED0017/01/01; GA MŠMT(CZ) LO1212
Institutional support: RVO:68081731
Keywords : optical tweezers * optical traps * optical trapstiffness * focused beam
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.859, year: 2015

Single beam optical tweezers hold particles behind the focal plane due to the high gradients of optical intensity present in a focused laser beam. However, description of this optical field based on a vectorial theory of diffraction reveals that the high intensity focal area is accompanied by several secondary maxima on the optical axis as well as by a structure of rings away of the optical axis. Such a structure can be found in beams exhibiting spherical aberrations as well as in beams where aberration is corrected. Here, we discuss possibility to use these secondary maxima of aberration-corrected beams as the optical traps. We present the properties of such traps created by objective lenses of various numerical apertures that are focusing plane waves.
Permanent Link: http://hdl.handle.net/11104/0248033