Tunable entangled photon emitters based on cavity-enhanced GaAs quantum dots on micromachined piezoelectric substrates was recorded at SPIE Optics + Photonics held in San Diego, California, United States 2022.
Semiconductor quantum dots (QDs) combine high optical activity and the possibility of integration in a myriad of devices. Here, we demonstrate the integration of (Al)GaAs QDs in nanophononic strings and show that the excitonic two-level system of the QD couples to the confined phononic modes in string. For the chosen design the coupling is mediated via the valence band deformation potential and shear strain. Finite element modelling (FEM) shows that the optomechanical coupling parameter γom>0.15 meV/nm, exceeding that of vibrating nanowire architectures by one order of magnitude1.