Abstract

We demonstrate, both numerically and experimentally, that metal–insulator–metal configurations in which the top metal layer consists of a periodic arrangement of nanobricks, thus supporting gap-surface plasmon resonances, can be designed to function as reflective broadband half-wave plates. Using gold as the metal, the constructed wave plates in the near-infrared regime show scalability, bandwidth of $\sim 20\%$ of the design wavelength, and theoretical reflectivity above 85%, while a reflectivity of $\sim 50\%$ is experimentally measured.

© 2013 Optical Society of America

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