Efficient and broadband quarter-wave plates by gap-plasmon resonators
- 31 January 2013
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 21 (3), 2942-2952
- https://doi.org/10.1364/oe.21.002942
Abstract
We demonstrate numerically that metal-insulator-metal (MIM) configurations in which the top metal layer consists of a periodic arrangement of nanobricks, thus facilitating gap-surface plasmon resonances, can be designed to function as efficient and broadband quarter-wave plates in reflection by a proper choice of geometrical parameters. Using gold as the metal, we demonstrate quarter-wave plate behavior at λ ≃ 800 nm with an operation bandwidth of 160 nm, conversion efficiency of 82%, and angle of linear polarization fixed throughout the entire bandwidth. This work also includes a detailed analytical and numerical study of the optical properties and underlying physics of structured MIM configurations.Keywords
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