23 January 2006 Giant optical activity in quasi-2D planar nanostructures
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Planar chirality can lead to interesting polarization effects whose interpretation has invoked possible violation of reciprocity and time reversality. We show that a quasi-two-dimensional array consisting of gold nanoparticles with no symmetry plane and having sub-wavelength periodicity and thickness exhibits giant specific rotation (~104 °/mm) at normal incidence. The rotation is the same for light incident on the front and back sides of the sample. Such reciprocity manifests three-dimensionality of the structure arising from the asymmetry of light-plasmon coupling at the air-metal and substrate-metal interfaces of the structure. The structures thus enable nanoscale polarization control but violate no symmetry principle.
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Makoto Kuwata-Gonokami, Makoto Kuwata-Gonokami, Nobuyoshi Saito, Nobuyoshi Saito, Yusuke Ino, Yusuke Ino, Kuniaki Konishi, Kuniaki Konishi, Martti Kauranen, Martti Kauranen, Konstantins Jefimovs, Konstantins Jefimovs, Tuomas Vallius, Tuomas Vallius, Jari Turunen, Jari Turunen, Yuri P. Svirko, Yuri P. Svirko, } "Giant optical activity in quasi-2D planar nanostructures", Proc. SPIE 6110, Micromachining Technology for Micro-Optics and Nano-Optics IV, 61100G (23 January 2006); doi: 10.1117/12.644491; https://doi.org/10.1117/12.644491

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