Simulation of InGaAs Quantum Dot Photonic Cavities for 850 nm Free-Space Optical Communication

On-demand and pure single photons are the backbone of various quantum applications. Popular nonlinear conversion-based spontaneous parametric downconversion suffers from its probabilistic nature and the trade-off between brightness and purity. However, quantum dots, vacancies, and 2D material based on-demand single photon emitters are viable. Here, we focus on solid-state quantum dots because of their dimension tunability and their emission. In this communication, we focus on a specific wavelength of 850 nm, emitted from a dot, important for free space optical communication, unexplored previously. The proposed structure includes quantum dot made of InGaAs within a DBR cavity or without. We have studied the electric field, cavity mode and extraction efficiency of the proposed structures using 3D FDTD simulations.