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Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

288
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
288

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Related Experiment Video

Updated: Jun 5, 2025

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Electrically switchable and tunable infrared light modulator based on functional graphene metasurface.

Wei Luo1, Syeda Aimen Abbasi1, Shaodi Zhu1

  • 1Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

A new graphene metasurface modulator offers electrically controlled infrared light modulation. It achieves over 90% efficiency for switching between perfect absorption and polarization conversion at 1550 nm.

Keywords:
electrical switching and tuningfunctional metasurfacegrapheneoptical modulatorpolarization converter

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene is a promising material for advanced optoelectronic devices.
  • Metasurfaces offer unique light manipulation capabilities.

Purpose of the Study:

  • To propose and theoretically study a novel graphene metasurface-based infrared light modulator.
  • To achieve electrically switchable and tunable modulation of infrared light.

Main Methods:

  • Theoretical study of a Fabry-Perot (FP) like nanostructure incorporating a monolayer graphene sheet.
  • Utilizing guided-mode resonance (GMR) for enhanced graphene electroabsorption.
  • Modulating graphene's Fermi energy (Ef) via bias-gate voltage.

Main Results:

  • Demonstrated significant enhancement of graphene electroabsorption due to GMR.
  • Achieved >90% conversion efficiency for switching between perfect absorber and reflective polarization converter at 1550 nm.
  • Showcased broad spectral tunability by adjusting graphene's Fermi energy.

Conclusions:

  • The proposed graphene metasurface modulator enables high-performance, electrically controlled infrared light modulation.
  • The design offers an effective strategy for developing tunable optoelectronic devices using 2D materials and metasurfaces.