Journal
OPTICS LETTERS
Volume 35, Issue 11, Pages 1755-1757Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.001755
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- U.S. Air Force Research Laboratories
- Dayton Area Graduate Studies Institute
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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(spp) (similar to 2.8 mu m) 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(spp) (C) 2010 Optical Society of America
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