Plasmonic lenses for wavefront control applications using two-dimensional nanometric cross-shaped aperture arrays
Plasmonic lenses for wavefront control applications using two-dimensional nanometric cross-shaped aperture arrays
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DOI：
10.1364/josab.28.000547
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发表时间：
2011-03
影响因子：
1.9
通讯作者：
X. Goh;Ling Lin;A. Roberts
中科院分区：
文献类型：
--
作者：
X. Goh;Ling Lin;A. Roberts
亚波长孔径内发生的局域表面等离子体共振伴随着孔径几何相关的相移，可用于光束操纵。在这里，我们展示了二维、平面、会聚和发散的等离子体透镜，由银膜中纳米级空间变化的十字形孔径阵列形成。使用共焦扫描光学显微镜在两种不同波长下评估具有不同设计配置的透镜的性能。
Localized surface plasmon resonances occurring within subwavelength apertures are accompanied by an aperture-geometry-dependent phase shift that can be utilized for beam manipulation. Here we demonstrate two-dimensional, planar, converging and diverging plasmonic lenses, formed by an array of nanometric spatially varying cross-shaped apertures in a silver film. The performance of lenses with different design configurations was evaluated at two different wavelengths using a confocal scanning optical microscope.