SECOND-ORDER NONLINEAR SUSCEPTIBILITY ENHANCEMENT IN GALLIUM NITRIDE NANOWIRES (INVITED)

We report the second-harmonic generation (SHG) from single GaN nanowire. The diameter of the GaN nanowire varies from 150 to 400 nm. We present a model for the SHG process in the GaN nanowire; the analysis shows quantitatively that the SHG is dominated by its surface area. The effective second order nonlinear optical susceptibility ([[chi].sup.(2).sub.eff]) increases as the diameter of the GaN nanowire decreases. For 150-nm diameter GaN nanowire, [[chi].sup.(2).sub.eff] reaches 136 pm/V.