Phys.org  June 29, 2022 A team of researchers in the US (UC Berkeley, Lawrence Berkeley National Laboratory) created a new type of semiconductor laser, dubbed Berkeley Surface Emitting Lasers (BerkSELs), that can maintain a single mode of emitted light while maintaining the ability to scale up in size and power. The BerkSEL design enabled the single-mode light emission because of the physics of the light passing through the holes in the membrane, a 200-nanometer-thick layer of indium gallium arsenide phosphide. The periodic holes in the membrane became Dirac points. By eliminating the need for external amplification, they could shrink the […]