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Transfer of Light Helicity to Nanostructures

By Kohei Toyoda, Fuyuto Takahashi, Shun Takizawa, Yu Tokizane, Katsuhiko Miyamoto, Ryuji Morita and Takashige Omatsu

Abstract

We discovered that chiral nanoneedles fabricated by vortex laser ablation can be used to visualize the helicity of an optical vortex. The orbital angular momentum of light determines the chirality of the nanoneedles, since it is transferred from the optical vortex to the metal. Only the spin angular momentum of the optical vortex can reinforce the helical structure of the created chiral nanoneedles. We also found that optical vortices with the same total angular momentum (defined as the sum of the orbital and spin angular momenta) are degenerate, and they generate nanoneedles with the same chirality and spiral frequency

Topics: 420
Publisher: 'American Physical Society (APS)'
Year: 2013
DOI identifier: 10.1103/PhysRevLett.110.143603
OAI identifier: oai:eprints.lib.hokudai.ac.jp:2115/60594
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