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Metasurface Light-Emitting Diodes with Directional and Focused Emission.

Yahya Mohtashami1, Larry K Heki2, Matthew S Wong2,3

  • 1Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, United States.

Nano Letters
|November 13, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel metasurface light-emitting diodes (LEDs) capable of emitting directional or focused light. These electroluminescent devices achieve high external quantum efficiencies, overcoming previous integration challenges.

Keywords:
LEDelectroluminescencegallium nitridemetasurface

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Area of Science:

  • Optoelectronics
  • Metamaterials
  • Nanotechnology

Background:

  • Phased-array metasurfaces offer precise control over light beams.
  • Previous photoluminescent metasurfaces inspired similar applications in electroluminescent devices.
  • Integrating metasurfaces into light-emitting diodes (LEDs) faced significant fabrication challenges.

Purpose of the Study:

  • To demonstrate the first functional metasurface LEDs.
  • To engineer directional and focused light emission from LEDs using metasurfaces.
  • To achieve high external quantum efficiencies (EQEs) in metasurface LEDs.

Main Methods:

  • Designed nanoribbon elements for phase control within LED constraints.
  • Fabricated metasurface LEDs integrating nanopatterned structures and electrodes.
  • Characterized the beam emission properties and EQEs of the fabricated devices.

Main Results:

  • Successfully demonstrated metasurface LEDs emitting directional and focused light.
  • Achieved engineered unidirectional emission via phased-array concepts.
  • Observed EQEs superior to those of unpatterned LEDs.

Conclusions:

  • Metasurface designs are compatible with high-EQE, metal-free LED devices.
  • This work overcomes integration challenges for phased-array metasurface LEDs.
  • Opens new avenues for LEDs directly producing complex light beam structures.