Title :
THz beam generation from YBCO thin films using a 1.55 μm femtosecond laser
Author :
Kondo, T. ; Tonouchi, M. ; Hangyo, M.
Author_Institution :
Res. Center for Superconductor Photonics, Osaka Univ., Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
High-Tc superconductor (HTS) is a promising material for terahertz (THz) electronics. The THz beam generation from YBa2 Cu3O7-δ (YBCO) thin film antennas using femtosecond (fs) laser pulses with a wavelength λ of around 1.55 μm is demonstrated. The mechanism of the THz beam generation is revealed to be the one photon excitation process corresponding to an intraband transition in the in-gap state. The properties of the THz beam generation excited by the 1.55 μm fs laser are similar to that excited by an 800 nm fs laser
Keywords :
Cooper pairs; antennas; barium compounds; high-speed optical techniques; high-temperature superconductors; optoelectronic devices; superconducting energy gap; superconducting thin films; yttrium compounds; 1.55 mum; HTS; THz beam generation; YBa2Cu3O7-δ; YBa2Cu3O7; femtosecond laser pulses; high-Tc superconductor; in-gap state; intraband transition; laser pulse wavelength; one photon excitation process; terahertz electronics; thin film antennas; High temperature superconductors; Laser beams; Laser excitation; Laser transitions; Optical materials; Optical pulse generation; Superconducting materials; Superconducting thin films; Transistors; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
