Abstract
We report on the radiation power of the terahertz (THz) beam from YBa 2Cu 3O 7− δ (YBCO) thin film antennas. InSb hot-electron bolometer is used to estimate the radiation power after being calibrated in the THz beam generation and detection system. The 100-nm-thick and 30-μm-wide YBCO thin film bridges are connected to a self-complimentary log-periodic toothed planar antenna or a bow-tie antenna. Femtosecond optical pulses are focused onto the center bridge of the antennas being biased with a current up to 1 A. The detected power increases in proportion with increasing bias current, and reaches over 22 μW in the average at an excitation power of 98 mW.
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