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Proceedings Paper

Optical activity in metal and dielectric planar chiral gratings
Author(s): Kuniaki Konishi; Natsuki Kanda; Benfeng Bai; Xiangfeng Meng; Petri Karvinen; Jari Turunen; Yuri P. Svirko; Makoto Kuwata-Gonokami
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Paper Abstract

When a linearly polarized light wave propagates in a chiral medium, the polarization plane azimuth rotates clockwise or counter-clockwise depending on the handedness of the material. This effect is called optical activity. It can be observed in a number of crystals and organic liquids, however the rotatory power of chiral materials available in nature is useally very small. That is why chiral planar micro- or nano-structures, which possess a much stronger rotatory power than natural chrial media, have attracted a considerable attention in recent years. We demonstrate large optical activity of chiral subwavelength gratings having no in-plane mirror symmetry and fabricated with metal thin films. For zeroth-order transmitted light, the chirality of these gratings manifests itself in the non-coplanarity of the electric field vectors at the air- and substrate-sides of the metal layer and can be interpreted in terms of the surface pllasmon enhanced non-local light-matter interaction. We demonstrate also that in all-dielectric subwavelength chiral gratings, the optical activity can be enhanced even stronger by using waveguide resonance. In the terahertz (THz) region, we obtain rotation of the polarization zimuth of a linearly polarized THz wave by using double-layered metal chiral structure with complimentary patterns.

Paper Details

Date Published: 2 September 2009
PDF: 13 pages
Proc. SPIE 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V, 73951F (2 September 2009); doi: 10.1117/12.827004
Show Author Affiliations
Kuniaki Konishi, The Univ. of Tokyo (Japan)
Natsuki Kanda, The Univ. of Tokyo (Japan)
Benfeng Bai, Univ. of Joensuu (Finland)
Xiangfeng Meng, Univ. of Joensuu (Finland)
Tsinghua Univ. (China)
Petri Karvinen, Univ. of Joensuu (Finland)
Jari Turunen, Univ. of Joensuu (Finland)
Yuri P. Svirko, Univ. of Joensuu (Finland)
Makoto Kuwata-Gonokami, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 7395:
Plasmonics: Nanoimaging, Nanofabrication, and their Applications V
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)

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