Abstract

The spiral plasmonic lens is capable of focusing the left-hand and right-hand circular polarizations into spatially separated plasmonic fields caused by the geometric phase effect. Its function as a circular polarization analyzer has been studied analytically and numerically in a previous Letter [Opt. Lett. 34, 3047 (2009)]. Single Archimedes’ spiral grooves with lateral sizes of approximately $4{\lambda }_{\mathrm{spp}}$ (~2.8 μm) were milled into a gold thin film by using a focused ion beam. The function of such a simple spiral plasmonic lens serving as a circular polarization analyzer was experimentally characterized with two-photon fluorescence microscopy. The circular polarization extinction ratio of the two-photon fluorescent signal is estimated to be larger than 200 for a detector diameter up to $0.3{\lambda }_{\mathrm{spp}}$

© 2010 Optical Society of America

Miniature circular polarization analyzer with spiral plasmonic lens

Shuangyang Yang, Weibin Chen, Robert L. Nelson, and Qiwen Zhan
Opt. Lett. 34(20) 3047-3049 (2009)

Efficient miniature circular polarization analyzer design using hybrid spiral plasmonic lens

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Hybrid spiral plasmonic lens: towards an efficient miniature circular polarization analyzer

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