A theory of electromagnetic surface-wave propagation on a plane superconductor–vacuum interface is presented. On the basis of a nonlocal description taking into account the finite size of the pair-bound state, the transverse and longitudinal parts of the conductivity response tensor are analyzed. Special emphasis is given to a study of the quasi-particle scattering and the two-quasi-particle emission and absorption processes in the near-local regime, i.e., the regime where nonlocal effects are incorporated in lowest order. Within the framework of the well-known semiclassical infinite-barrier model, the hydrodynamic model, extended to include nonlocal effects in the divergence-free part of the response, is used to establish a simple analytical expression for the dispersion relation of surface waves on a Cooper-paired superconductor. Attention is paid to the frequency dispersion of the waves near the superconducting gap.
© 1990 Optical Society of AmericaFull Article | PDF Article
Guifang Li and S. R. Seshadri
J. Opt. Soc. Am. B 7(6) 998-1012 (1990)
David T. Wei
Appl. Opt. 28(14) 2718-2722 (1989)
S. D. Brorson, R. Buhleier, I. E. Trofimov, J. O. White, Ch. Ludwig, F. F. Balakirev, H.-U. Habermeier, and J. Kuhl
J. Opt. Soc. Am. B 13(9) 1979-1993 (1996)