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Optimization of an object shape to achieve extremal axial optical force in a standing wave

SYSNO ASEP	0335079
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Optimization of an object shape to achieve extremal axial optical force in a standing wave
Author(s)	Trojek, Jan (UPT-D) Karásek, Vítězslav (UPT-D)_{RID, SAI} Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID}
Source Title	Optical Trapping and Optical Micromanipulation VI. (Proceedings of SPIE Vol. 7400). - Bellingham : SPIE, 2009 - ISSN 0277-786X - ISBN 978-0-8194-7690-6
Pages	74000l: 1-11
Number of pages	11 s.
Action	Optical Trapping and Optical Micromanipulation /6./
Event date	02.08.2009-06.08.2009
VEvent location	San Diego
Country	US - United States
Event type	WRD
Language	eng - English
Country	US - United States
Keywords	optical force ; nonspherical objects ; analytical calculations ; numerical computations ; coupled dipole method
Subject RIV	BH - Optics, Masers, Lasers
R&D Projects	LC06007 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	OC08034 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z20650511 - UPT-D (2005-2011)
DOI	10.1117/12.826035
Annotation	We consider prolate objects of cylindrical symmetry with radius periodically modulated along the axial direction and we present a theoretical study of optimized objects shapes resulting in up to tenfold enhancement of the axial optical force in comparison with the original unmodulated object shape. We obtain analytical formulas for the axial optical force acting on low refractive index objects where the light scattering by the object is negligible. Numerical results based on the coupled dipole method support the previous simplified analytical conclusions and they are also presented for objects with higher refractive indices. The objects are trapped in a standing wave, that offers many useful advantages in comparison to single beam trapping, especially for submicrometer size particles. It provides axial force stronger by several orders of magnitude, much higher axial trap stiffness, and spatial confinement of particles with higher refractive index.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2010

Number of the records: 1