SPECKLE CORRELATIONS IN THE LIGHT REFLECTED AND TRANSMITTED HV METAL-FILMS WITH ROUGH SURFACES - SURFACE-WAVE EFFECTS

Diagrammatic perturbation theory is used to compute the angular intens ity correlation function for p-polarized light reflected from, and tra nsmitted through, a thin, free-standing, metallic film. The illuminate d surface of the film is taken to be a weakly rough, one-dimensional, random surface and the back surface is planar. Contributions to the an gular intensity correlation function in both reflection and transmissi on include: (a) short-range memory effect and time-reversed memory eff ect terms, C-(1); (b) an additional short-range term of comparable mag nitude C-(10); (c) a long-range term C-(2); (d) an infinite-range term C-(3); and (e) a term C-(1.5) that along with C-(2) displays peaks as sociated with the excitation of the two surface plasmon polaritons sup ported by the film. The new features in these correlation functions fo r the reflection of Light from, and its transmission through, the roug h film, in comparison with those for the reflection of light from a se mi-infinite metal with a random surface, are the presence of additiona l peaks in C-(1) and C-(2) occurring when conditions involving the dif ference of the wave numbers of the two surface plasmon polaritons at t he frequency of the incident Light are satisfied. New, additional, res onant peaks are also present in C-(1.5). These, however, are a consequ ence of the existence of two surface plasmon polaritons instead of one , and have the same origin as the peaks in C-(1.5) in reflection from a semi-infinite metal with a random surface. (C) 1998 Elsevier Science B.V. All rights reserved.