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Adjoint-Optimized Large Dielectric Metasurface for Enhanced Purcell Factor and Directional Photon Emission
Erfan Khoram1, Zongfu Yu1, S Ali Hassani Gangaraj2
1Department of Electrical and Computer Engineering, University of Wisconsin Madison, Madison, Wisconsin 53706, United States.
ACS Omega
|June 17, 2024
Summary
This study introduces a novel topology optimization method for designing large metasurfaces. These metasurfaces efficiently enhance light extraction and direct photons from quantum sources for nanophotonic applications.
Area of Science:
- Quantum optics
- Nanophotonics
- Metasurface design
Background:
- Efficient photon extraction from quantum sources is vital for quantum technologies.
- Existing small-aperture devices have limitations in directivity and light guiding.
- Large metasurfaces offer potential for enhanced performance in nanophotonic systems.
Purpose of the Study:
- To develop an adjoint-based topology optimization approach for designing large light extractors.
- To enhance spontaneous emission rates and collimate photons from quantum transitions.
- To create all-dielectric metasurfaces for improved nanophotonic system performance.
Main Methods:
- Adjoint-based topology optimization for metasurface design.
- Design of all-dielectric metasurfaces for quantum transitions at λ = 600 nm.
- Analysis of spontaneous emission enhancement and photon beam collimation.
Main Results:
- Achieved a broadband enhancement of spontaneous emission by up to 10× compared to vacuum.
- Demonstrated metasurfaces that beam extracted light into a narrow cone (±10°).
- Successfully directed light along predefined directions.
Conclusions:
- The proposed optimization approach enables the design of efficient large-area light extractors.
- All-dielectric metasurfaces significantly boost spontaneous emission and control photon directionality.
- This work advances the development of nanophotonic systems for quantum applications.
