Ultra-High Efficiency and Broad Band Operation of Infrared Metasurface Anomalous Reflector based on Graphene Plasmonics

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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Nature Portfolio
Abstract

Infrared metasurface anomalous reflector with ultra-high efficiency and broad band operation is designed via multi-sheet graphene layer with triangular holes. The anomalous reflection angle covers the range of 10 degrees to 90 degrees with the efficiency higher than 80%, over a broad spectral range from 7 mu m-40 mu m of infrared spectrum. It reaches above 92% at the center wavelength in the spectral response. By increasing the periodicity of phase gradient, we can expand this frequency band even further without losing efficiency. The compact design of metasurface affords the adjustability of the electrochemical potential level of graphene by means of gating. Additionally, the impact of the number of graphene sheets for the optimum efficiency of the proposed structure is investigated. By adding the secondary graphene metasurface with opposite direction of phase gradient, we demonstrated the tunability of the reflection angle from 0(r) to - 0(r) with bias voltage.

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Keywords
PHASE DISCONTINUITIES, LIGHT, WAVES, Multidisciplinary Sciences
Citation
Soleymani, S., Güngördü, M. Z., Kung, P., & Kim, S. M. (2019). Ultra-High Efficiency and Broad Band Operation of Infrared Metasurface Anomalous Reflector based on Graphene Plasmonics. In Scientific Reports (Vol. 9, Issue 1). Springer Science and Business Media LLC. https://doi.org/10.1038/s41598-018-37562-y