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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Mie metasurfaces for enhancing photon outcoupling from single embedded quantum emitters.

Samuel Prescott1, Prasad P Iyer2,3, Sadhvikas Addamane2,3

  • 1Electronic and Electrical Engineering, University College London, London, WC1E 7JE, UK.

Nanophotonics (Berlin, Germany)
|June 5, 2025
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Summary

Mie metasurfaces enhance single photon outcoupling from quantum emitters (QE) by over ten times. This efficient, polarization-selective platform improves photon collection for quantum information processing without precise QE alignment.

Keywords:
Mie resonatormetasurfacequantum dotquantum emitterquantum informationsingle photon source

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Area of Science:

  • Quantum optics
  • Nanophotonics
  • Solid-state physics

Background:

  • Solid-state quantum emitters (QE) are crucial for quantum information processing, generating single photons.
  • However, QEs suffer from poor directivity and polarization definition, leading to significant photon loss.
  • Efficiently outcoupling photons from QEs is a major challenge in quantum technology.

Purpose of the Study:

  • To propose and numerically evaluate Mie metasurface designs for enhanced photon outcoupling from embedded, randomly-positioned QEs.
  • To investigate the impact of Mie metasurfaces on photon outcoupling efficiency and photon loss.
  • To explore the role of electric dipole modes in achieving polarization-selective outcoupling.

Main Methods:

  • Numerical evaluation of Mie metasurface designs.
  • Simulation of photon outcoupling from embedded and randomly-positioned quantum emitters.
  • Analysis of electric dipole modes for polarization control.

Main Results:

  • Mie metasurfaces achieve over one order of magnitude enhancement in photon outcoupling.
  • Photon loss is minimized to only several percent.
  • Enhancement is achieved without strict QE position alignment or affecting the intrinsic QE emission rate (Purcell enhancement).
  • Electric dipole modes enable selective outcoupling for specific polarizations, including out-of-plane emission.

Conclusions:

  • Mie metasurfaces offer an efficient solution for outcoupling photons from solid-state quantum emitters.
  • The proposed designs provide polarization-selective control and scalability for quantum applications.
  • This platform significantly reduces photon loss and improves the performance of quantum information processing.