| Abstract 摘要 | Probing and modeling of carrier motions in materials as well as in electronic devices is a fundamental research subject in science and electronics. According to the Maxwell electromagnetic field theory, carriers are a source of electric field. Therefore, by probing dielectric polarization caused by the electric field arising from charges, we can find a way to visualize carrier motions and carrier distributions in materials. The techniques used here is a novel optical method based on electric field induced optical second harmonic generation (EFISHG) measurement. The EFISHG probes nonlinear polarization induced in organic active layers due to coupling of electron clouds of molecules and electro-magnetic waves of incident laser beam in the presence of DC field caused from charges in organic materials. In my talk, we briefly discuss the principle of detection of the electric field by using the EFISHG, and then visualize anisotropic carrier transport in organic thin films, and electrostatic electrification phenomena. If I have time, I will discuss the interesting electric transport properties of DNA. |
