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Related Experiment Video

Updated: Feb 15, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Published on: July 24, 2015

Electronically Tunable Perfect Absorption in Graphene.

Seyoon Kim¹, Min Seok Jang^1,2, Victor W Brar^1,3,4

¹Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology , Pasadena, California 91125, United States.

|January 11, 2018

Summary

This summary is machine-generated.

Researchers achieved electronically tunable perfect absorption in graphene using novel nanophotonic structures. This breakthrough enhances light modulation for flat optics applications by improving graphene plasmonic nanoresonator coupling.

Keywords:

Graphene mid-infrared optical modulator perfect absorption plasmonics tunable resonance

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Area of Science:

Nanophotonics
Optoelectronics
Materials Science

Background:

Growing demand for dynamically tunable light modulation in flat optics.
Graphene nanostructures show potential for high effective index tunability and absorption.
Previous limitations include poor radiative coupling and low carrier mobility in processed graphene.

Purpose of the Study:

To demonstrate electronically tunable perfect absorption in graphene devices.
To overcome limitations of poor radiative coupling and low modulation depth.
To enhance light modulation capabilities for flat optics.

Main Methods:

Incorporation of multiscale nanophotonic structures with a low-permittivity substrate.
Use of subwavelength noble metal plasmonic antennas to enhance radiative coupling.
Development of a graphical method based on effective surface admittance for structure design.
Analysis of critical coupling between radiation and graphene plasmonic modes.

Main Results:

Achieved 96.9% absorption in the graphene plasmonic nanostructure at 1389 cm^-1.
Demonstrated an on/off modulation efficiency of 95.9% in reflection.
Graphene nanostructures covered less than 10% of the total surface area.

Conclusions:

Successfully demonstrated electronically tunable perfect absorption in graphene.
The multiscale nanophotonic structure design enhances radiative coupling and overcomes previous limitations.
This work provides a pathway for advanced tunable light modulation in flat optics.