Obtaining circularly polarized optical spots beyond the diffraction limit using plasmonic nano-antennas
Öğüt, Erdem and Kızıltaş, Güllü and Şendur, Kürşat (2010) Obtaining circularly polarized optical spots beyond the diffraction limit using plasmonic nano-antennas. In: 2009 MRS Fall Meeting, Boston, USA
Official URL: http://dx.doi.org/10.1557/PROC-1208-O21-02
With advances in nanotechnology, emerging plasmonic nano-optical applications, such as all-optical magnetic recording, require circularly-polarized electromagnetic radiation beyond the diffraction limit. In this study, a plasmonic cross-dipole nano-antenna is investigated to obtain a circularly polarized near-field optical spot with a size smaller than the diffraction limit of light. The performance of the nano-antenna is investigated through numerical simulations. In the first part of this study, the nano-antenna is illuminated with a diffraction-limited circularly-polarized radiation to obtain circularly polarized optical spots at nanoscale. In the second part, diffraction limited linearly polarized radiation is used. An optimal configuration for the nano-antenna and the polarization angle of the incident light is identified to obtain a circularly polarized optical spot beyond the diffraction limit from a linearly polarized diffraction limited radiation.
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