Study of Ultrafast Light-Electromagnetic Wave Transforming Devices for Ultrafast Communications Using High-T_c Superconducors

Terahertz Radiation from High-Tc Superconductors Excited by Optical Pulses and Related Topics

Abstract

Ultrashort electromagnetic pulses (0.45ps time width) are radiated into free spece from high-T_c superconducting films fabricated into antenna structures by exciting with ultrashort laser pulses. The Fourier spectrum of them extends from 0.1 to 3THz. Basic characteristics of the radiation are studied, including the dependence on the bias current, external magnetic field, exciting laser power, etc. Possible applications of this new phenomenon to high speed wireless communications, characterization of materials and memory devices are also presented.