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Three-Dimensional Optical Trapping of a Plasmonic Nanoparticle using Low Numerical Aperture Optical Tweezers

SYSNO ASEP	0446101
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Three-Dimensional Optical Trapping of a Plasmonic Nanoparticle using Low Numerical Aperture Optical Tweezers
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} Paták, Aleš (UPT-D)_{RID, ORCID, SAI} Pokorná, Zuzana (UPT-D)_{RID, ORCID, SAI} Mika, Filip (UPT-D)_{RID, SAI, ORCID} Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID}
Number of authors	9
Source Title	Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322 Roč. 5, JAN 29 (2015), 08106:1-9
Number of pages	9 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	discrete-dipole approximation ; gold nanoparticles ; radiation forces ; spectroscopy
Subject RIV	BH - Optics, Masers, Lasers
R&D Projects	GB14-36681G GA ČR - Czech Science Foundation (CSF)
Institutional support	UPT-D - RVO:68081731
UT WOS	000348500800010
EID SCOPUS	84922985325
DOI	10.1038/srep08106
Annotation	It was previously believed that larger metal nanoparticles behave as tiny mirrors that are pushed by the light beam radiative force along the direction of beam propagation, without a chance to be confined. However, several groups have recently reported successful optical trapping of gold and silver particles as large as 250 nm. We offer a possible explanation based on the fact that metal nanoparticles naturally occur in various non-spherical shapes and their optical properties differ significantly due to changes in localized plasmon excitation. We demonstrate experimentally and support theoretically three-dimensional confinement of large gold nanoparticles in an optical trap based on very low numerical aperture optics. We showed theoretically that the unique properties of gold nanoprisms allow an increase of trapping force by an order of magnitude at certain aspect ratios. These results pave the way to spatial manipulation of plasmonic nanoparticles using an optical fibre, with interesting applications in biology and medicine.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2016

Number of the records: 1