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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Phase-Continuous Reconfigurable Transmissive Metasurface without Air Gaps.

Bingquan Xu1,2, Guiqiong Huang3, XiaoBing Feng2,4

  • 1School of Electronic Science and Engineering (School of Microelectronics), South China Normal University, Foshan 528225, China.

ACS Applied Materials & Interfaces
|August 10, 2025
PubMed
Summary

This study introduces a novel, air-gap-free reconfigurable transmissive metasurface. It offers superior phase-tunable resolution, advancing metasurface technology for wireless communication and imaging.

Keywords:
air gapsmultifunctionphase-continuous reconfigurabletransmissive metasurfacevaractors

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Area of Science:

  • Electromagnetics and Metamaterials
  • Applied Physics

Background:

  • Conventional reconfigurable transmissive metasurfaces often feature air gaps, complicating design and limiting performance.
  • Existing air-gap-free metasurface designs exhibit suboptimal phase-tunable resolution.

Purpose of the Study:

  • To present a phase-continuous reconfigurable transmissive metasurface without air gaps.
  • To achieve high phase-tunable resolution and efficient signal modulation.

Main Methods:

  • Utilized Huygens' surface theory for design.
  • Incorporated a multilayer interconnected meta-unit with integrated varactors.
  • Controlled magnetic resonance characteristics for Huygens' resonance.

Main Results:

  • Achieved 224° continuous phase modulation at 6.7 GHz.
  • Demonstrated average transmittance of 0.7 from 6.7-7 GHz.
  • Obtained a phase-tunable resolution of approximately 1°/0.1 V.

Conclusions:

  • The proposed metasurface exhibits excellent phase-continuous dynamic reconfigurable capabilities.
  • Experimental validation includes beam steering, real-time dynamic focusing, and simultaneous dual focusing.
  • This advancement supports next-generation wireless communication and intelligent imaging.