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

• DOI: 10.1364/opticaopen.22689892.v1
• Publication Date: 2023-04-26T09:48:27Z
• Authors: Constantin Schmidt; Chenxi Ma; Frederik Benthin; Jingzhong Yang; Eddy Rugeramigabo; Michael Zopf; Fei Ding
• Keywords: Photon entanglement

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