Planar Lenses Based on Nanoscale Slit Arrays in a Metallic Film
Nano Letters2008Vol. 9(1), pp. 235–238
Citations Over TimeTop 1% of 2008 papers
Lieven Verslegers, Peter B. Catrysse, Zongfu Yu, Justin S. White, Edward S. Barnard, Mark L. Brongersma, Shanhui Fan
Abstract
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.
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