TY - JOUR

T1 - High efficiency grating couplers for strain tunable GaAs quantum dot based entangled photon sources

AU - Schmidt, Constantin

AU - Ma, Chenxi

AU - Benthin, Frederik

AU - Yang, Jingzhong

AU - Rugeramigabo, Eddy P.

AU - Zopf, Michael

AU - Ding, Fei

N1 - Funding Information: The authors gratefully acknowledge the funding by the German Federal Ministry of Education and Research (BMBF) within the projects QR.X (Grant No. 16KISQ015) and SemIQON (Grant No. 13N16291), the European Research Council (Grant No. QD-NOMS GA715770), the German Research Foundation under Germany’s Excellence Strategy—Grant No. EXC-2123, and Quantum Frontiers—Grant Nos. 390837967 and 45463526. The publication of this article was funded by the Open Access Publishing Fund of Leibniz Universität Hannover.

PY - 2024/1

Y1 - 2024/1

N2 - The on-chip integration of single photon and entangled photon emitters such as epitaxially grown semiconductor quantum dots into photonic frameworks is a rapidly evolving research field. GaAs quantum dots offer high purity and a high degree of entanglement due to, in part, exhibiting very small fine structure splitting along with short radiative lifetimes. Integrating strain-tunable quantum dots into nanostructures enhances the quantum optical fingerprint, i.e., radiative lifetimes and coupling of these sources, and allows for on-chip manipulation and routing of the generated quantum states of light. Efficient out-coupling of photons for off-chip processing and detection requires carefully engineered mesoscopic structures. Here, we present numerical studies of highly efficient grating couplers reaching up to over 90% transmission. A 2D Gaussian mode overlap of 83.39% for enhanced out-coupling of light from within strain-tunable photonic nanostructures for free-space transmission and single-mode fiber coupling is shown. The photon wavelength under consideration is 780 nm, corresponding to the emission from GaAs quantum dots resembling the 87Rb D2 line. The presented numerical study helps implement such sources for applications in complex quantum optical networks.

AB - The on-chip integration of single photon and entangled photon emitters such as epitaxially grown semiconductor quantum dots into photonic frameworks is a rapidly evolving research field. GaAs quantum dots offer high purity and a high degree of entanglement due to, in part, exhibiting very small fine structure splitting along with short radiative lifetimes. Integrating strain-tunable quantum dots into nanostructures enhances the quantum optical fingerprint, i.e., radiative lifetimes and coupling of these sources, and allows for on-chip manipulation and routing of the generated quantum states of light. Efficient out-coupling of photons for off-chip processing and detection requires carefully engineered mesoscopic structures. Here, we present numerical studies of highly efficient grating couplers reaching up to over 90% transmission. A 2D Gaussian mode overlap of 83.39% for enhanced out-coupling of light from within strain-tunable photonic nanostructures for free-space transmission and single-mode fiber coupling is shown. The photon wavelength under consideration is 780 nm, corresponding to the emission from GaAs quantum dots resembling the 87Rb D2 line. The presented numerical study helps implement such sources for applications in complex quantum optical networks.

UR - http://www.scopus.com/inward/record.url?scp=85183991973&partnerID=8YFLogxK

U2 - 10.1063/5.0160086

DO - 10.1063/5.0160086

M3 - Article

AN - SCOPUS:85183991973

VL - 14

JO - AIP Advances

JF - AIP Advances

SN - 2158-3226

IS - 1

M1 - 015244

ER -