Fig. 2: Diamond-AlGaN/AlN interface optimization.
From: Hetero-integrated diamond-on-AlGaN/AlN waveguides for optical color center interfacing
a SEM image of the cleaved facet of an AlGaN/AlN waveguide showing the different material layers in the xy-plane. b Tip angle of the AlGaN/AlN waveguide along its tapered segment in the yz-plane. c List of parameters optimized in three distinct diamond-on-AlGaN/AlN interface designs. The parameters that are fixed during the optimization of the respective design are indicated with asterisks. d Simulated coupling efficiency intervals for Design 1 and the given fabrication uncertainty bounds. Blue bars represent the full range of efficiencies that result from sweeping a respective geometry parameter within its fabrication uncertainty bounds. Orange dots and error bars indicate the mean values and standard deviations of the full coupling efficiency ranges. The red line denotes the coupling efficiency of the ideal Design 1 configuration.
