Perfect impedance matching with meta-surfaces made of ultra-thin metal films: A phenomenological approach to the ideal thz sensors

Binglei Zhang, Yang Liu, Yi Luo, Feodor V. Kusmartsev, Anna Kusmartseva

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The terahertz (THz) frequency range is incredibly important as it covers electromagnetic emissions typical for biological and molecular processes. All molecules emit THz waves in a unique fingerprint pattern, although the intensity of such signals is usually too weak to be detected. To address the efficiency gap in existing THz devices it is extremely important to create surfaces with perfect anti-reflection properties. Although metals are absolutely reflective, here we show both theoretically and experimentally that by constructing meta-surfaces made of a superposition of ultra-thin metallic nano-films (a couple of nanometres thick) and oxide layers a unique property of perfect transmission and impedance matching may be realised. The perfect transmission rates can be as high as 100% and it may be achieved in both optical and THz regimes. The predicted effect has been observed for numerous meta-surfaces of different compositions. The effect found here is expected to impact the renewable energies sectors, optoelectronic and telecommunication industries, accelerating the arrival of the sensors for the new 6G-technology. The phenomenon is highly relevant to all scientific fields where minimising electromagnetic losses through reflection is important.

Original languageBritish English
Article number5417
Pages (from-to)1-16
Number of pages16
JournalMaterials
Volume13
Issue number23
DOIs
StatePublished - 1 Dec 2020

Keywords

  • Anti-reflection
  • Impedance matching
  • Meta-surfaces
  • Metal nanofilms
  • Optical
  • Oxide layers
  • Terahertz waves
  • THz devices

Fingerprint

Dive into the research topics of 'Perfect impedance matching with meta-surfaces made of ultra-thin metal films: A phenomenological approach to the ideal thz sensors'. Together they form a unique fingerprint.

Cite this