Dielectric GaAs-antenna ensuring an efficient broadband coupling between an InAs quantum-dot light emitter and a Gaussian optical beam
Mathieu Munsch, Nitin S. Malik, Emmanuel Dupuy, Adrien Delga, Joël Bleuse, Jean-Michel Gérard, Julien Claudon, Niels Gregersen, and Jesper Mørk
Accepted
We introduce the photonic trumpet, a dielectric structure which ensures a nearly perfect coupling between an embedded quantum light source and a Gaussian free-space beam. A photonic trumpet exploits both the broadband spontaneous emission control provided by a single-mode photonic wire and the expansion of this mode within a conical taper. Numerical simulations highlight the performance and robustness of this concept. As a first application in the field of quantum optics, we report the realisation of an ultra-bright single-photon source. The device, a high aspect ratio GaAs photonic trumpet containing a few InAs quantum dots, demonstrates a first-lens external efficiency of 0.75 0.1 and an external coupling efficiency to a Gaussian beam as high as 0.58 0.08.