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Opt Lett. 2010 Jun 1;35(11):1755-7. doi: 10.1364/OL.35.001755.

Two-photon fluorescence characterization of spiral plasmonic lenses as circular polarization analyzers.

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  • 1Electro-Optics Program, University of Dayton, 300 College Park, Dayton, Ohio 45469, USA.


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)OPLEDP0146-959210.1364/OL.34.003047]. Single Archimedes' spiral grooves with lateral sizes of approximately 4lambda(spp) (approximately 2.8 microm) 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 0.3lambda(spp).

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