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Orbital motion from optical spin: the extraordinary momentum of circularly polarized light beams

SYSNO ASEP	0494376
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Orbital motion from optical spin: the extraordinary momentum of circularly polarized light beams
Author(s)	Svak, Vojtěch (UPT-D)_{RID, SAI} Brzobohatý, Oto (UPT-D)_{RID, ORCID, SAI} Šiler, Martin (UPT-D)_{RID, ORCID, SAI} Jákl, Petr (UPT-D)_{RID, ORCID, SAI} Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID} Simpson, Stephen Hugh (UPT-D)_{RID, SAI}
Number of authors	6
Source Title	Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar. - Brno : Institute of Scientific Instruments The Czech Academy of Sciences, 2018 - ISBN 978-80-87441-23-7
Pages	s. 78-79
Number of pages	2 s.
Publication form	Print - P
Action	Recent Trends in Charged Particle Optics and Surface Physics Instrumentation
Event date	04.06.2018 - 08.06.2018
VEvent location	Skalský dvůr
Country	CZ - Czech Republic
Event type	WRD
Language	eng - English
Country	CZ - Czech Republic
Keywords	optical trapping ; optical levitation ; counter-propagating beams ; optical spin
Subject RIV	JA - Electronics ; Optoelectronics, Electrical Engineering
OECD category	Optics (including laser optics and quantum optics)
R&D Projects	GB14-36681G GA ČR - Czech Science Foundation (CSF)
	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	000450591400030
Annotation	We provide a vivid demonstration of the mechanical effect of transverse spin momentum in an optical beam in free space. This component of the Poynting momentum was previously thought to be virtual, and unmeasurable. Here, its effect is revealed in the inertial motion of a probe particle in a circularly polarized Gaussian trap, in vacuum. Transverse spin forces combine with thermal fluctuations to induce a striking range of non-equilibrium phenomena. With increasing beam power we observe (i) growing departures from energy equipartition, (ii) the formation of coherent, thermally excited orbits and, ultimately, (iii) the ejection of the particle from the trap. Our results complement and corroborate recent measurements of spin momentum in evanescent waves, and extend them to a new geometry, in free space. In doing so, we exhibit fundamental, generic features of the mechanical interaction of circularly polarized light with matter. The work also shows how observations of the under-damped motion of probe particles can provide detailed information about the nature and morphology of momentum flows in arbitrarily structured light fields as well as providing a test bed for elementary non-equilibrium statistical mechanics.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2019

Number of the records: 1