Journal
ACS NANO
Volume 9, Issue 4, Pages 4111-4119Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00218
Keywords
metasurface; half-wave plate; plasmonic antennas; background-free
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Funding
- U.S. Army Research Office [63133-PH (W911NF-13-1-0226)]
- Air Force Office of Scientific Research MURI grant Active Metasurfaces for Advanced Wavefront Engineering and Waveguiding
- Chinese Scholarship Council (CSC) [201306320012]
- National Natural Science Foundation of China [91233208, 61271016, 61178062]
- National High Technology Research and Development Program (863 Program) of China [2012AA030402]
- Swedish VR grant [621-2011-4620]
- AOARD
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We design, fabricate, and experimentally demonstrate an ultrathin, broadband half-wave plate in the near-infrared range using a plasmonic metasurface. The simulated results show that the linear polarization conversion efficiency is over 97% with over 90% reflectance across an 800 nm bandwidth. Moreover, simulated and experimental results indicate that such broadband and high-efficiency performance is also sustained over a wide range of incident angles. To further obtain a background-free half-wave plate, we arrange such a plate as a periodic array of integrated supercells made of several plasmonic antennas with high linear polarization conversion efficiency, consequently achieving a reflection-phase gradient for the cross-polarized beam. In this design, the anomalous (cross-polarized) and the normal (copolarized) reflected beams become spatially separated, hence enabling highly efficient and robust, background-free polarization conversion along with broadband operation. Our results provide strategies for creating compact, integrated, and high-performance plasmonic circuits and devices.
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