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

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

We provide a vivid demonstration of the mechanical effect of transverse spin momentum in annoptical beam in free space. This component of the Poynting momentum was previously thoughtnto be virtual, and unmeasurable. Here, its effect is revealed in the inertial motion of a probenparticle in a circularly polarized Gaussian trap, in vacuum. Transverse spin forces combine withnthermal fluctuations to induce a striking range of non-equilibrium phenomena. With increasingnbeam power we observe (i) growing departures from energy equipartition, (ii) the formation ofncoherent, thermally excited orbits and, ultimately, (iii) the ejection of the particle from the trap.nOur results complement and corroborate recent measurements of spin momentum in evanescentnwaves, and extend them to a new geometry, in free space. In doing so, we exhibit fundamental,ngeneric features of the mechanical interaction of circularly polarized light with matter. The worknalso shows how observations of the under-damped motion of probe particles can provide detailedninformation about the nature and morphology of momentum flows in arbitrarily structured lightnfields as well as providing a test bed for elementary non-equilibrium statistical mechanics.

Název v anglickém jazyce

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

Popis výsledku anglicky

We provide a vivid demonstration of the mechanical effect of transverse spin momentum in annoptical beam in free space. This component of the Poynting momentum was previously thoughtnto be virtual, and unmeasurable. Here, its effect is revealed in the inertial motion of a probenparticle in a circularly polarized Gaussian trap, in vacuum. Transverse spin forces combine withnthermal fluctuations to induce a striking range of non-equilibrium phenomena. With increasingnbeam power we observe (i) growing departures from energy equipartition, (ii) the formation ofncoherent, thermally excited orbits and, ultimately, (iii) the ejection of the particle from the trap.nOur results complement and corroborate recent measurements of spin momentum in evanescentnwaves, and extend them to a new geometry, in free space. In doing so, we exhibit fundamental,ngeneric features of the mechanical interaction of circularly polarized light with matter. The worknalso shows how observations of the under-damped motion of probe particles can provide detailedninformation about the nature and morphology of momentum flows in arbitrarily structured lightnfields as well as providing a test bed for elementary non-equilibrium statistical mechanics.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar

ISBN

978-80-87441-23-7

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

78-79

Název nakladatele

Institute of Scientific Instruments The Czech Academy of Sciences

Místo vydání

Brno

Místo konání akce

Skalský dvůr

Datum konání akce

4. 6. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000450591400030