Planar Lenses Based on Nanoscale Slit Arrays in a Metallic Film

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• 作者：Lieven Verslegers ; Peter B. Catrysse ; Zongfu Yu ; Justin S. White ; Edward S. Barnard ; Mark L. Brongersma ; Shanhui Fan
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：January 14, 2009
• 年：2009
• 卷：9
• 期：1
• 页码：235-238
• 全文大小：187K
• 年卷期：v.9,no.1(January 14, 2009)
• ISSN：1530-6992

文摘

We experimentally demonstrate planar lenses based on nanoscale slit arrays in a metallic film. Our lens structures consist of optically thick gold films with micron-size arrays of closely spaced, nanoscale slits of varying widths milled using a focused ion beam. We find excellent agreement between electromagnetic simulations of the design and confocal measurements on manufactured structures. We provide guidelines for lens design and show how actual lens behavior deviates from simple theory.