Ultrafast polarization conversion with plasmonic crystals

Details Ultrafast polarization conversion with plasmonic crystals Ultrafast polarization conversion with plasmonic crystals

2011-05-24

arxiv.org/abs/1105.4730v1

Physics

Optics

4 pages, 5 figures

Scientific paper

Femtosecond-scale polarization state conversion is experimentally found in optical response of a plasmonic nanograting by means of time-resolved polarimetry. Simultaneous measurements of the Stokes parameters as a function of time with an averaging time-gate of 130 fs reveal a remarkable alteration of polarization state inside a single fs-pulse reflected from a plasmonic crystal. Time-dependent depolarization is experimentally found and described within an analytical model which predicts the four-fold enhancement of the polarization conversion effect with the use of the narrower gate. The effect is attributed to excitation of time-delayed polarization-sensitive surface plasmons with a highly birefringent Fano-type spectral profile.

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