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arXiv · 1105.4730

Ultrafast polarization conversion with plasmonic crystals

M. R. Shcherbakov·P. P. Vabishchevich·V. V. Komarova·T. V. Dolgova·A. A. Fedyanin
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Abstract

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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M. R. Shcherbakov, P. P. Vabishchevich, V. V. Komarova, T. V. Dolgova, A. A. Fedyanin. 2011-05-24. Ultrafast polarization conversion with plasmonic crystals. https://doi.org/10.1103/physrevlett.108.253903

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