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Nearfield Beam Shaping Through Tuning Diffraction Coupling Angles

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Abstract:

In this paper, nearfield focusing using depth-tuned grooves in a thin metal film is studied. With numerical simulations, we show that the focusing effect can be improved using an aperiodic structure by tuning the position and the depth of the grooves. A physical interpretation of this result is provided by considering the coupling angle between a plane wave and the surface mode supported by a periodic groove array. It is suggested that nearfield focusing or beam shaping can be achieved by bending the wave towards a spot using the coupling angles. We succeeded in designing a nanolens with an aperiodic structure to gain a long depth of focus of 280 nm with a uniform focus width.

Keywords: METALLIC STRUCTURE; NANOLENS DESIGN; PLASMONIC LENS

Document Type: Research Article

DOI: https://doi.org/10.1166/jctn.2010.1447

Publication date: 2010-06-01

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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