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Optical resonant Archimedean spiral antennas

J. Nanophoton. 5, 053523 (Sep 26, 2011); http://dx.doi.org/10.1117/1.3643270

Hanqing Wen, Jing Yang, Weiwei Zhang, and Jiasen Zhang

State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China jszhang@pku.edu.cn; jingyang@pku.edu.cn

We investigated the field enhancement properties of optical resonant Archimedean spiral antennas by using a finite difference time domain method. Due to the spiral structure, the antennas show a circular dichroism in the electric field enhancement, especially for a large turning angle. A large magnetic field enhancement is also obtained with a confinement in the nanometer size. When the turning angle equals π for a linearly polarized incident beam, the polarization of the enhanced field in the spiral antenna can be perpendicular to the incident polarization with a similar enhancement factor to the optical resonant dipole antennas.

© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

History
Received Jul 07, 2011
Accepted Sep 06, 2011
Revised Sep 04, 2011
Published online Sep 26, 2011
Citation
Hanqing Wen, Jing Yang, Weiwei Zhang and Jiasen Zhang, "Optical resonant Archimedean spiral antennas", J. Nanophoton. 5, 053523 (Sep 26, 2011); http://dx.doi.org/10.1117/1.3643270

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