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Research Paper

Applied Science and Convergence Technology 2022; 31(2): 60-62

Published online March 30, 2022

https://doi.org/10.5757/ASCT.2022.31.2.60

Copyright © The Korean Vacuum Society.

Polarized Single Photon Generation from a Quantum Dot

Hyun-Ju Ahna , Yudong Jangb , and Donghan Leea , b , *

aDepartment of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
bInstitute of Quantum Systems (IQS), Chungnam National University, Daejeon 34134, Republic of Korea

Correspondence to:E-mail: dleee@cnu.ac.kr

Received: January 20, 2022; Revised: December 9, 0220; Accepted: January 29, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The linearly polarized single photon is a key component for single-photon applications, such as quantum simulators and quantum key distribution. Here, we propose a novel approach for generating linearly polarized single photons using a simple elliptic mesa containing an InAs/GaAs quantum dot (QD). We found that 91% of the QD emission can be linearly polarized along the major axis for an elliptic mesa with a minor axis diameter of 300 nm. The degree of linear polarization of the QD emission was studied with the polarization mode distribution in the QD layer of the elliptic mesa by finite-difference time-domain simulations. The mode polarized along the major axis was dominant over the mesa plane, especially in the center for the 300 nm mesa, enabling high linear polarization of single photons emitted from the mesa. The proposed method for generating linearly polarized single photons using a simple elliptic mesa, which features a broad operation band and can be easily fabricated, will be potentially useful in numerous single-photon applications.

Keywords: Quantum dot, Single photon, Elliptic mesa, Polarization, Simulation

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