Počet záznamů: 1  

Direct measurements of the extraordinary optical\nmomentum and transverse spin-dependent force\nusing a nano-cantilever

  1. 1.
    0464552 - UPT-D 2017 RIV GB eng J - Článek v odborném periodiku
    Antognozzi, M. - Bermingham, C.R. - Harniman, R.L. - Simpson, Stephen Hugh - Senior, J. - Hayward, I.R. - Hoerber, H. - Dennis, M.R. - Bekshaev, A.Y. - Bliokh, K.Y. - Nori, F.
    Direct measurements of the extraordinary optical
    momentum and transverse spin-dependent force
    using a nano-cantilever.
    Nature Physics. Roč. 12, č. 8 (2016), s. 731-735. ISSN 1745-2473
    Grant CEP: GA MŠk(CZ) LO1212
    Institucionální podpora: RVO:68081731
    Klíčová slova: radiation-pressure * angular-momentum * microscopy
    Kód oboru RIV: BH - Optika, masery a lasery
    Impakt faktor: 22.806, rok: 2016

    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.
    Trvalý link: http://hdl.handle.net/11104/0263414