skip to main content

SciTech ConnectSciTech Connect

Title: Terahertz focusing of multiple wavelengths by graphene metasurfaces

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.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ; ;  [1] ;  [4]
  1. Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601 (Australia)
  2. (Australia)
  3. School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2612 (Australia)
  4. (CUDOS), Australian National University, Canberra, ACT 2601 (Australia)
Publication Date:
OSTI Identifier:
22489310
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM SHAPING; BEAMS; CONTROL; EFFICIENCY; FERMI LEVEL; FOCUSING; GRAPHENE; HOLOGRAPHY; MIRRORS; REFLECTION; RESONATORS; WAVELENGTHS