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This study demonstrates electrical control over light absorption in metafilms using tunable plasmonic cavities. Indium tin oxide (ITO) in the epsilon-near-zero (ENZ) regime enables significant, electrically-driven changes in light absorption.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanophotonics

Background:

  • Light absorption control is crucial for optoelectronic devices.
  • Traditional methods use Fabry-Pérot resonances or patterned metafilms.
  • Active tuning of absorption properties remains a challenge.

Purpose of the Study:

  • To demonstrate electrical control over light absorption in metafilms.
  • To utilize actively tunable plasmonic cavities for enhanced light absorption.
  • To investigate the role of indium tin oxide (ITO) in electrical tuning.

Main Methods:

  • Constructing metafilms from dense arrays of actively tunable plasmonic cavities.
  • Embedding indium tin oxide (ITO) within these plasmonic cavities.
  • Operating ITO in the epsilon-near-zero (ENZ) frequency regime for optical property tuning.

Main Results:

  • Achieved significant electrical control over light absorption.
  • Demonstrated large changes in metafilm reflectance (up to 15% P).
  • Leveraged ITO's tunable optical properties via electrical carrier modulation.

Conclusions:

  • Electrical control of light absorption in metafilms is feasible.
  • ITO's ENZ regime offers a powerful mechanism for active optical tuning.
  • This approach advances the development of tunable optoelectronic devices.