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

被引：25

作者：

Wu, Zhi ^{[1
]}

Chen, Weibin ^{[1
]}

Abeysinghe, Don C. ^{[2
]}

Nelson, Robert L. ^{[3
]}

Zhan, Qiwen ^{[1
]}

机构：

[1] Univ dayton, Electroopt Program, Dayton, OH 45469 USA

[2] Univ Cincinnati, Cincinnati, OH 45219 USA

[3] USAF, Res Lab, Dayton, OH 45433 USA

来源：

OPTICS LETTERS | 2010年 / 35卷 / 11期

关键词：

EVANESCENT BESSEL BEAM; SURFACE-PLASMONS; LIGHT;

D O I：

10.1364/OL.35.001755

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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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收藏

页码：1755 / 1757

页数：3

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