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 of the design wavelength, and theoretical reflectivity above 85%, while a reflectivity of is experimentally measured.
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Anders Pors, Michael G. Nielsen, Giuseppe Della Valle, Morten Willatzen, Ole Albrektsen, and Sergey I. Bozhevolnyi
Opt. Lett. 36(9) 1626-1628 (2011)
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