[9p-W541-1~8] Science created by singularity in nitride-semiconductors; Development of nano-characterization and control of material properties

[9p-W541-6] Polarization mapping of nitride semiconductors using laser THz emission microscopy

〇Iwao Kawayama¹ (1.ILE, Osaka Univ.)

Keywords:terahertz, widegap semiconductor, polarization

The amplitudes and the phases of the terahertz radiations induced by the illumination of femtosecond laser pulses reflect transient photocurrents and/or modulation of polarizations excited by the laser pulses. In this study, we systematically investigate the relation between various singularity structures in semiconductors and characteristics of terahertz radiations from their structures, and elucidate the generation mechanism of the terahertz radiations.