Terahertz focusing of multiple wavelengths by graphene metasurfaces

Liming Liu; Yair Zarate; Haroldo T. Hattori; Dragomir N. Neshev; Ilya V. Shadrivov; David A. Powell

doi:10.1063/1.4940231

Terahertz focusing of multiple wavelengths by graphene metasurfaces

Liming Liu^*, Yair Zarate, Haroldo T. Hattori, Dragomir N. Neshev, Ilya V. Shadrivov, David A. Powell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Metasurfaces can achieve nearly arbitrary wavefront control based on manipulation of the wave phase profile. We propose a metasurface based on double graphene cut-wire resonators which can cover the complete 2π phase region with high reflection efficiency. This full phase coverage is essential for efficient wavefront manipulation, without reflecting energy into unwanted channels. A mirror capable of focusing multiple wavelengths is demonstrated numerically based on the proposed structure. The mirror can effectively focus terahertz (THz) waves from 1.2 to 1.9 THz to the same focal point by changing the Fermi level of each graphene resonator separately. The presented metasurface could provide a powerful platform for controlling THz waves, including focusing, beam steering, beam shaping, and holography.

Original language	English
Article number	031106
Journal	Applied Physics Letters
Volume	108
Issue number	3
DOIs	https://doi.org/10.1063/1.4940231
Publication status	Published - 18 Jan 2016

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abstract = "Metasurfaces can achieve nearly arbitrary wavefront control based on manipulation of the wave phase profile. We propose a metasurface based on double graphene cut-wire resonators which can cover the complete 2π phase region with high reflection efficiency. This full phase coverage is essential for efficient wavefront manipulation, without reflecting energy into unwanted channels. A mirror capable of focusing multiple wavelengths is demonstrated numerically based on the proposed structure. The mirror can effectively focus terahertz (THz) waves from 1.2 to 1.9 THz to the same focal point by changing the Fermi level of each graphene resonator separately. The presented metasurface could provide a powerful platform for controlling THz waves, including focusing, beam steering, beam shaping, and holography.",

author = "Liming Liu and Yair Zarate and Hattori, {Haroldo T.} and Neshev, {Dragomir N.} and Shadrivov, {Ilya V.} and Powell, {David A.}",

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AU - Liu, Liming

AU - Zarate, Yair

AU - Hattori, Haroldo T.

AU - Neshev, Dragomir N.

AU - Shadrivov, Ilya V.

AU - Powell, David A.

PY - 2016/1/18

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N2 - Metasurfaces can achieve nearly arbitrary wavefront control based on manipulation of the wave phase profile. We propose a metasurface based on double graphene cut-wire resonators which can cover the complete 2π phase region with high reflection efficiency. This full phase coverage is essential for efficient wavefront manipulation, without reflecting energy into unwanted channels. A mirror capable of focusing multiple wavelengths is demonstrated numerically based on the proposed structure. The mirror can effectively focus terahertz (THz) waves from 1.2 to 1.9 THz to the same focal point by changing the Fermi level of each graphene resonator separately. The presented metasurface could provide a powerful platform for controlling THz waves, including focusing, beam steering, beam shaping, and holography.

AB - Metasurfaces can achieve nearly arbitrary wavefront control based on manipulation of the wave phase profile. We propose a metasurface based on double graphene cut-wire resonators which can cover the complete 2π phase region with high reflection efficiency. This full phase coverage is essential for efficient wavefront manipulation, without reflecting energy into unwanted channels. A mirror capable of focusing multiple wavelengths is demonstrated numerically based on the proposed structure. The mirror can effectively focus terahertz (THz) waves from 1.2 to 1.9 THz to the same focal point by changing the Fermi level of each graphene resonator separately. The presented metasurface could provide a powerful platform for controlling THz waves, including focusing, beam steering, beam shaping, and holography.

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Terahertz focusing of multiple wavelengths by graphene metasurfaces

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