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Longitudinal Shaping of Subwavelength Infrared Beams using Plasmonic Bull’s-eye Structure with Concentric Slits

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Abstract

We report a bull’s-eye gold nanostructure, which focuses infrared beams into subwavelength spots with the ability to shape the longitudinal intensity profile and the focal length, thus addressing many challenges in label-free imaging, nanolithography, and biomedical applications.

© 2017 Optical Society of America

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