Bungay, A.R., Popov, S.V., Zheludev, N.I. and Svirko, Y.P.
Specular nonlinear anisotropic polarization effect along fourfold crystal symmetry axes.
Optics Letters, 20, (4), . (doi:10.1364/OL.20.000356).
We present what is to our knowledge the first experimental observation of the specular nonlinear anisotropic polarization effect of a pump-induced polarization-plane rotation for normal-incidence reflection from the (001) surface of a cubic crystal. In GaAs, azimuth rotation of the order of 9 × 10^-6 rad is seen for a pump intensity of 75 MW/cm^-2 at 750 nm, from which the anisotropic component of the cubic nonlinearity |Re(?xxxx ? 2?xxyy ? ?xyyx)| = 5 × 10^-9 esu is found.
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