title: Broadband plasmonic half-wave plates in reflection.
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 ~20% of the design wavelength, and theoretical reflectivity above 85%, while a reflectivity of ~50% is experimentally measured.
authors: Institute of Technology and Innovation (ITI), University of Southern Denmark, Niels Bohrs Allé 1, Odense M DK-5230, Denmark. alp@iti.sdu.dk
authors: Anders
authors: A
authors: Pors
authors: Michael G
authors: MG
authors: Nielsen
authors: Sergey I
authors: SI
authors: Bozhevolnyi