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Monolithic Polarizing Circular Dielectric Gratings on Bulk Substrates for Improved Photon Collection from InAs
Ryan A DeCrescent1, Zixuan Wang1,2, Poolad Imany1,2
1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
Physical Review Applied
|April 15, 2024
Summary
We developed new dielectric gratings for improved photon collection from Indium Arsenide (InAs) quantum dots on bulk substrates. This enhances their use in integrated quantum systems.
Area of Science:
- Solid-state physics
- Quantum optics
- Materials science
Background:
- III-V semiconductor quantum dots (QDs) are excellent single-photon sources with broad applications.
- Integrating QDs with photonic and optoelectronic systems requires efficient photon collection.
- Existing methods often involve complex substrate integration (suspended or wafer-bonded).
Purpose of the Study:
- To develop monolithic circular dielectric gratings on bulk substrates for enhanced photon collection from InAs QDs.
- To improve the integration of QDs with other quantum systems requiring bulk substrates.
Main Methods:
- Fabrication of monolithic circular dielectric gratings on bulk substrates.
- Utilized a two-tiered distributed Bragg reflector (DBR) for electric field confinement.
- Incorporated opposing 'openings' in cavities to induce polarized luminescence.
Main Results:
- Achieved greatly improved photon collection efficiency from InAs QDs.
- Demonstrated strong polarization of QD luminescence without compromising collection efficiency.
- Analyzed the dependence of collection enhancement on specific collection optics.
Conclusions:
- Monolithic dielectric gratings on bulk substrates offer a viable route for efficient QD integration.
- The developed structures are suitable for interfacing QDs with bulk-substrate quantum systems, like surface acoustic wave phonons.
- Careful consideration of collection optics is crucial for evaluating photonic structure performance.
