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We measured the transient absorption changes of a near-infrared (NIR) pulse in GaAs quantum well under a multicycle THz wave driving. By changing the delay between the NIR probe and the THz wave, the absorption strength can be modulated on a sub-cycle timescale of THz wave, indicating the formation of THz-induced dressed states of excitons.
This paper is concerned with an analysis of the back scattering of an electromagnetic wave by a target moving along just above a random rough surface such as desert, hilly terrain, sea surface and so on. First we introduce the discrete ray tracing method (DRTM) for the field analysis of back scattering. Second we investigate the effect of clutter due to back scattering from the random rough surface...
An modified estimation algorithm for radio communication distance along random rough surfaces (RRS) is proposed in this paper. RRSs are generated by the convolution method, and its density functions are selected Gaussian, n-th order power law and exponential spectrum. First, electromagnetic fields are calculated numerically by using the Discrete Ray-Tracing Method (DRTM). Next, the conventional estimation...
Among the insulation defects in GIS under the operating condition, metallic particles adhered to the solid spacer would be the most critical situation against the surge voltage applications. Nevertheless, because of the complicated partial discharge (PD) mechanisms, PD detection can be recognized very difficult in GIS diagnostic techniques. In this paper, we have successfully simulated the condition...
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