Large-scale Simulation for a Terahertz Resonance Superconductor Device

This study is aiming at designing by large-scale simulations a new nano-scale devices of high temperature superconductor (HTC) that would emit the terahertz wave continuously, for the purpose of developing a new application fields of teraherz waves that have been abandoned so far as the untapped frequency range between photon and radio waves. As a new light source, the continuous and frequency tunable terahertz wave, especially in the range of 1-4 THz, would be applicable to the advanced research fields of material science, bioscience, medical and information technology. Our challenge is set to develop the device to generate the terahertz wave using high temperature superconductor. The mechanism of generating the continuous terahertz waves, its optimum conditions and the frequency control have been revealed so far through the large scale simulation that run on the Earth Simulator with vast computing power. One of challenges we are tackling is to design a wave guide that lead the terahertz waves generated out of the device to the object for flexible irradiation. In the wave guide the terahertz wave propagates dynamically with varying wavelengths from nanometer to millimeters. Thus, for searching the optimum conditions of design, it is required to perform large and multi-scale simulation on the nonlinear dynamics of terahertz in the three dimensional space of the device and wave guide. In this term, we have developed a two dimensional simulation model for designing the way of emitting the terahertz waves as Josephson plasma out of the device to the outer-space.