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Non-spherical gold nanoparticles trapped in optical tweezers: Shape matters

SYSNO ASEP	0446048
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Non-spherical gold nanoparticles trapped in optical tweezers: Shape matters
Author(s)	Brzobohatý, Oto (UPT-D)_{RID, ORCID, SAI} Šiler, Martin (UPT-D)_{RID, ORCID, SAI} Trojek, Jan (UPT-D) Chvátal, Lukáš (UPT-D)_{RID, ORCID, SAI} Karásek, Vítězslav (UPT-D)_{RID, SAI} Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID}
Number of authors	6
Source Title	Optics Express. - : Optical Society of America - ISSN 1094-4087 Roč. 23, č. 7 (2015), s. 8179-8189
Number of pages	11 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	discrete-dipole approximation ; anisotropic particles ; plasmon-resonance ; gaussian beams ; microparticles ; spectroscopy
Subject RIV	BH - Optics, Masers, Lasers
R&D Projects	GA14-16195S GA ČR - Czech Science Foundation (CSF)
	TE01020233 GA TA ČR - Technology Agency of the Czech Republic (TA ČR)
	LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	UPT-D - RVO:68081731
UT WOS	000352290000022
EID SCOPUS	84928019891
DOI	10.1364/OE.23.008179
Annotation	We present the results of a theoretical analysis focused on three-dimensional optical trapping of non-spherical gold nanoparticles using a tightly focused laser beam (i.e. optical tweezers). We investigate how the wavelength of the trapping beam enhances trapping stiffness and determines the stable orientation of nonspherical nanoparticles in the optical trap which reveals the optimal trapping wavelength. We consider nanoparticles with diameters being between 20 nm and 254 nm illuminated by a highly focused laser beam at wavelength 1064 nm and compare our results based on the coupled-dipole method with published theoretical and experimental data. We demonstrate that by considering the non-spherical morphology of the nanoparticle we can explain the experimentally observed three-dimensional trapping of plasmonic nanoparticles with size higher than 170 nm. These results will contribute to a better understanding of the trapping and alignment of real metal nanoparticles in optical tweezers and their applications as optically controllable nanosources of heat or probes of weak forces and torques.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2016

Number of the records: 1