Large tunable lateral shift in prism coupling system containing a superconducting slab

A large and tunable lateral shift in a prism coupling system with a superconducting YBa₂Cu₃O₇ film is theoretically analyzed. The dip of the reflectivity and magnitude of the lateral shift can be controlled by the temperature of the superconducting film. The sign of the lateral shift can be determined by the thickness of the superconducting film. The position of the minimum reflection and maximum Goos–Hänchen shift can be conveniently adjusted by the thickness of the dielectric layer and incident light frequency. The largest shift, as high as 1550 times the free space wavelength, is achieved for the incident light frequency $\omega =98$ THz. The numerical calculation results from the Gaussian beam are in accordance with the theoretical results.