Polarization of Brillouin scattered light in silica nanofibers
Résumé
We investigate both theoretically and experimentally the polarization
properties of Brillouin light scattering in silica optical nanofibers.
Our results show that while all hybrid acoustic waves scatter light
without altering the state of polarization, one of the surface acoustic
wave generates a depolarized Stokes light. Because of the slight
ellipticity of the nanofiber, the surface wave is actually split into
two torso-radial modes which give rise to polarization scrambling of the
backward Brillouin Stokes signal. Our model also predicts that the
polarization of the scattered light can be restored for one specific
pump polarization.
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