Terahertz focusing of multiple wavelengths by graphene metasurfaces
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 18, 2016
- Source ID
- 10.1063/1.4940231
Entities
People
- David A. Powell
- Dragomir N. Neshev
- Haroldo T Hattori
- Ilya V. Shadrivov
- Liming Liu
- Yair Zárate
Organizations
- Air Force Office of Scientific Research
- Australian National University
- University of New South Wales