Title :
Enhanced THz radiation from YBCO thin film bow-tie antennas with hyper-hemispherical MgO lens
Author :
Tonouchi, M. ; Tani, M. ; Wang, Z. ; Sakai, K. ; Hangyo, M. ; Wada, N. ; Murakami, Y.
Author_Institution :
Kansai Adv. Res. Center, Commun. Res. Lab., Kobe, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
We demonstrate power enhancement of terahertz (THz) radiation from YBCO thin films. An ultra-wide-band electromagnetic pulse, which contains frequency components over 3 THz, was excited by ultrafast supercurrent modulation with femtosecond optical pulse irradiation. The maximum THz radiation power emitted into free space was achieved up to 0.5 /spl mu/W with the combination of a bow-tie antenna and an MgO hyper-hemispherical lens. We discuss the radiation power dependence on temperature, excitation power, and bias supercurrent.
Keywords :
barium compounds; high-temperature superconductors; lens antennas; magnesium compounds; submillimetre wave antennas; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.5 muW; 3 THz; MgO; YBCO thin film bow-tie antenna; YBaCuO; femtosecond optical pulse irradiation; hyper-hemispherical MgO lens; terahertz radiation power; ultra-wide-band electromagnetic pulse; ultrafast supercurrent; EMP radiation effects; Frequency; Lenses; Optical modulation; Optical pulses; Pulse modulation; Transistors; Ultra wideband technology; Ultrafast optics; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
