18 April 2016 Voltage-tunable optical transmission of subwavelength metal gratings filled with liquid crystals
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Abstract
Two electrooptical effects in a system consisting of subwavelength aluminum gratings and a nematic liquid crystal (LC) layer are discussed. The aluminum gratings produced by a focused ion beam lithography act as interdigitated electrodes, which allows application of an electric field to a very thin fraction of LC layer contacting the grating. The first of the electrooptical effects is associated with an enhanced TE-polarized light transmission of the gratings and the surface induced twist deformation in the bulk of the LC layer, whereas the second one is caused by an influence of the electrically driven LC surface layer on the plasmonic resonance and the related dip of the TM-polarized grating transmission. Besides the different polarizations, the two effects have dramatically different response times. In the case of the plasmonic effect, the measured response time is found to be of 20 - 30 microseconds that is three orders of magnitude faster compared to the switching based on the surface induced twist effect.
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Serguei P. Palto, Mikhail I. Barnik, Vladimir V. Artemov, Irina V. Kasyanova, Nikolay M. Shtykov, Artur R. Geivandov, Sergey G. Yudin, Maxim V. Gorkunov, "Voltage-tunable optical transmission of subwavelength metal gratings filled with liquid crystals", Proc. SPIE 9883, Metamaterials X, 988307 (18 April 2016); doi: 10.1117/12.2227096; https://doi.org/10.1117/12.2227096
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