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29 April 2010 Asymmetric second harmonic generation in chiral optical metamaterials
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We report that in the absence of electric dipole contributions, upon azimuthal sample rotation, the corresponding SHG response was found to be chiral, i.e. it shows the presence of asymmetries with a sense of rotation (lack of mirror symmetry). It was found that this sense of rotation reverses with the handedness configuration (G and mirror-G, see Fig. 1). While it is apparent that the property originates in local field enhancements of electric and/or magnetic multipoles, its explanation invites further theoretical research.
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V. K. Valev, A. V. Silhanek, W. Gillijns, O. A. Aktsipetrov, V. V. Moshchalkov, and T. Verbiest "Asymmetric second harmonic generation in chiral optical metamaterials", Proc. SPIE 7711, Metamaterials V, 77111S (29 April 2010);

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