Fig. 1. Schematic diagram of a transmission-type THz time domain spectroscopy based on a GaAs photoconductive antenna and a 1 mm-thick ZnTe (110) crystal as a detector with a low temperature cryostat. QWP: Quarter Wave-Plate. BS: Beam Splitter.
Fig. 3. Scanning electron microscope (SEM) images of the cross-section of the two GdBCO films with the thicknesses of (a) 105 nm and (b) 58 nm.
Fig. 5. Temperature-dependent transmittance curves of the two GdBCO films with the thicknesses of 105 nm (blue triangle) and 58 nm (red circle) at 0.7 THz.
Fig. 2. (a) Electro-optic sampling signal in time-domain, through the bare aperture (black dashed), LAO (red solid), and STO (blue dashed dot). (b) Transmitted electric field amplitude spectra of LAO and STO.
Fig. 4. (a) THz time-domain signals through the 58 nm-thick GdBCO film depending on the temperature in the range of 22 K and 200 K. (b) Fourier-transformed THz transmittance spectra in the frequency range between 0.2 and 1.5 THz.