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Study of a large-area THz antenna by using a finite difference time domain method and lossy transmission line

Large-area THz antennas are studied by using a finite difference time domain method and a lossy transmission line model. The temporal evolution of an emitted pulse from a specified antenna is experimentally realized, the result is compared with the numerical result and good agreement is observed. The effect of the laser beam spot size, carrier life-time and collision time on temporal evolution of a THz pulse is investigated using this technique.