Monolithic Polarizing Circular Dielectric Gratings on Bulk Substrates for Improved Photon Collection from InAs Quantum Dots

Published

December 7, 2023

Author(s)

Ryan DeCrescent, Zixuan Wang, Poolad Imany, Sae Woo Nam, Richard Mirin, Kevin L. Silverman

Abstract

III-V semiconductor quantum dots (QDs) are near-ideal and versatile single-photon sources. Be- cause of the capacity for monolithic integration with photonic structures as well as optoelectronic and optomechanical systems, they are proving useful in an increasingly broad application space. Here, we develop monolithic circular dielectric gratings on bulk substrates - as opposed to suspended or wafer-bonded - for 100-fold improved photon collection from InAs quantum dots. The structures utilize a unique two-tiered distributed Bragg reflector (DBR) structure for effective field confine- ment over a broad angular range. Opposing "openings" in the cavities induce strongly polarized QD luminescence without harming collection efficiencies. We describe how measured enhancements depend critically on the choice of collection optics. This is important to consider when evaluating the performance of any photonic structure that concentrates farfield emission intensity. Our cavity designs are useful for integrating QDs with other quantum systems that require bulk substrates, such as surface acoustic wave phonons.

Citation

Physical Review Applied

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevApplied.20.064013

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Keywords

quantum dots, gallium arsenide, nanophotonics

Citation

DeCrescent, R. , Wang, Z. , Imany, P. , Nam, S. , Mirin, R. and Silverman, K. (2023), Monolithic Polarizing Circular Dielectric Gratings on Bulk Substrates for Improved Photon Collection from InAs Quantum Dots, Physical Review Applied, [online], https://doi.org/10.1103/PhysRevApplied.20.064013, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956666 (Accessed October 10, 2025)