Direct measurements of the extraordinary opticalnmomentum and transverse spin-dependent forcenusing a nano-cantilever

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F16%3A00464552" target="_blank" >RIV/68081731:_____/16:00464552 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1038/NPHYS3732" target="_blank" >http://dx.doi.org/10.1038/NPHYS3732</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/NPHYS3732" target="_blank" >10.1038/NPHYS3732</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Direct measurements of the extraordinary opticalnmomentum and transverse spin-dependent forcenusing a nano-cantilever

Popis výsledku v původním jazyce

Radiation pressure is associated with the momentum of light(1,2), and it plays a crucial role in a variety of physical systems(3-6). It is usually assumed that both the optical momentum and the radiation-pressure force are naturally aligned with the propagation direction of light, given by its wavevector. Here we report the direct observation of an extraordinary optical momentum and force directed perpendicular to the wavevector, and proportional to the optical spin (degree of circular polarization). Such an optical force was recently predicted for evanescent waves' and other structured fields'. It can be associated with the 'spin-momentum' part of the Poynting vector, introduced by Belinfante in field theory 75 years ago(9-11). We measure this unusual transverse momentum using a femtonewton-resolution nano-cantilever immersed in an evanescent optical field above the total internal reflecting glass surface. Furthermore, the measured transverse force exhibits another polarization-dependent contribution determined by the imaginary part of the complex Poynting vector. By revealing new types of optical forces in structured fields, our findings revisit fundamental momentum properties of light and enrich optomechanics.

Název v anglickém jazyce

Direct measurements of the extraordinary opticalnmomentum and transverse spin-dependent forcenusing a nano-cantilever

Popis výsledku anglicky

Radiation pressure is associated with the momentum of light(1,2), and it plays a crucial role in a variety of physical systems(3-6). It is usually assumed that both the optical momentum and the radiation-pressure force are naturally aligned with the propagation direction of light, given by its wavevector. Here we report the direct observation of an extraordinary optical momentum and force directed perpendicular to the wavevector, and proportional to the optical spin (degree of circular polarization). Such an optical force was recently predicted for evanescent waves' and other structured fields'. It can be associated with the 'spin-momentum' part of the Poynting vector, introduced by Belinfante in field theory 75 years ago(9-11). We measure this unusual transverse momentum using a femtonewton-resolution nano-cantilever immersed in an evanescent optical field above the total internal reflecting glass surface. Furthermore, the measured transverse force exhibits another polarization-dependent contribution determined by the imaginary part of the complex Poynting vector. By revealing new types of optical forces in structured fields, our findings revisit fundamental momentum properties of light and enrich optomechanics.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BH - Optika, masery a lasery

OECD FORD obor

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Projekt

<a href="/cs/project/LO1212" target="_blank" >LO1212: ALISI - Centrum pokročilých diagnostických metod a technologií</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Nature Physics

ISSN

1745-2473

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

731-735

Kód UT WoS článku

000381239800010

EID výsledku v databázi Scopus

2-s2.0-84964301734