PCSEL stands for "photonic crystal surface-emitting laser." It refers to a type of laser diode that emits light from its surface rather than from the edges.
Photonic crystals are periodic nanostructures that can control the propagation of light. In a PCSEL, these photonic crystals are integrated into the device structure to enable efficient light emission from the surface. By carefully engineering the photonic crystal structure, PCSELs can achieve high-power output, narrow linewidth, and single-mode operation.
PCSELs have various applications, including optical communications, optical sensing, medical imaging, and laser printing. Their surface-emitting nature simplifies packaging and integration into photonic circuits, making them promising candidates for next-generation optoelectronic devices.