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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

863
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...
863

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Electrically Modulated Gap Interference for Tunable Plasmonic Metasurfaces.

Xinyu Wen1,2,3,4, Hongquan Yu2,3,4, Jinghui Gao1,2,3

  • 1State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

Nano Letters
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed electrically tunable plasmonic metasurfaces. These devices offer continuous wavelength modulation using low voltages, enabling dynamic control for advanced nanophotonic applications.

Keywords:
lattice resonanceoptical interferencethermal expansionthermal straintransparent conductive oxidetunable metasurface

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Area of Science:

  • Nanophotonics
  • Metamaterials
  • Plasmonics

Background:

  • Plasmonic metasurfaces offer nanoscale optical field control but typically have fixed properties post-fabrication.
  • This limitation restricts their application in dynamic optical systems.

Purpose of the Study:

  • To demonstrate electrically modulated plasmonic metasurfaces for tunable wavelength applications.
  • To achieve continuous and reversible optical modulation using low voltages.

Main Methods:

  • Fabrication of metasurfaces using silver nanoparticle lattices and gold electrodes on ITO/quartz.
  • Integration with an air gap or polystyrene microspheres for modulation.
  • Application of CMOS-compatible voltages (below 5 V) to induce thermal stress and modulate surface lattice resonance via an interference mode.

Main Results:

  • Achieved continuous and reversible wavelength modulation.
  • Demonstrated tuning sensitivities of approximately 0.5 nm/V.
  • Obtained modulation rates up to 10 Hz.
  • Utilized thermal stress from voltage application to alter air gap thickness and shift resonance wavelength.

Conclusions:

  • Electrically modulated plasmonic metasurfaces enable dynamic wavelength control.
  • The demonstrated technology offers potential for tunable nanophotonic devices.
  • Applications include optical imaging, displays, and communications.