Room Temperature Lasing Characteristics in Metal-Coated GaN Spiral and Grating Structures

We had investigated a metal-coated GaN spiral structure laser at room temperature. The lasing action was observed around 363 nm wavelength with a low threshold power density. We also compare the lasing characteristics from metal-coated GaN spiral and grating structures. The experiment results ensure the circular-polarized emission from the metal-coated GaN spiral laser.