We demonstrate the emission of sub-picosecond electromagnetic waves from YBa2Cu3O7-δ thin-film bow-tie antennas. Femtosecond laser-pulse irradiation creates a radiative supercurrent transient in the films, and freely propagated radiation is detected and characterized. The low-frequency component of the radiation was greatly enhanced by using bow-tie antennas instead of dipole antennas. We discuss the antenna effects on both the radiation spectra and the radiation power.
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Tani et al. (1996) studied this question.
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