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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Direct measurements of the extraordinary opticalnmomentum and transverse spin-dependent forcenusing a nano-cantilever
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Project
<a href="/en/project/LO1212" target="_blank" >LO1212: ALISI - Centre of advanced diagnostic methods and technologies</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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