Optical activity in metal and dielectric planar chiral gratings

Kuniaki Konishi; Natsuki Kanda; Benfeng Bai; Xiangfeng Meng; Petri Karvinen; Jari Turunen; Yuri P. Svirko; Makoto Kuwata-Gonokami

doi:10.1117/12.827004

2 September 2009 Optical activity in metal and dielectric planar chiral gratings

Kuniaki Konishi, Natsuki Kanda, Benfeng Bai, Xiangfeng Meng, Petri Karvinen, Jari Turunen, Yuri P. Svirko, Makoto Kuwata-Gonokami

Author Affiliations +

Proceedings Volume 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V; 73951F (2009) https://doi.org/10.1117/12.827004
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

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.

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Kuniaki Konishi, Natsuki Kanda, Benfeng Bai, Xiangfeng Meng, Petri Karvinen, Jari Turunen, Yuri P. Svirko, and Makoto Kuwata-Gonokami "Optical activity in metal and dielectric planar chiral gratings", Proc. SPIE 7395, Plasmonics: Nanoimaging, Nanofabrication, and their Applications V, 73951F (2 September 2009); https://doi.org/10.1117/12.827004

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KEYWORDS

Metals

Optical activity

Polarization

Dielectric polarization

Terahertz radiation

Surface plasmons

Interfaces

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