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Planar Lenses Based on Nanoscale Slit Arrays in a Metallic Film

2008; American Chemical Society; Volume: 9; Issue: 1 Linguagem: Inglês

10.1021/nl802830y

1530-6992

Lieven Verslegers, Peter B. Catrysse, Zongfu Yu, Justin S. White, Edward S. Barnard, Mark L. Brongersma, Shanhui Fan,

Fluid Dynamics and Thin Films

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.