<title>Dynamic behavior of speckles from rough surface scattering</title>

Abstract

In this paper, we present the experimental resu'ts of the dynamic behavior of speckles from rough surface scattering to verify the validity of the theoretical analysis. Recently, McGurn and Maradudin have predicted an additional short-range correlation C(b0), which shows symmetry of speckles around the specular direction in the far-field scattering from a rough surface. We have measured this peak with a twodimensional rough dielectric film on a glass substrate. We have also measured the speckle trucking in the specular direction, the rotation invariance, and the time-reversed speckle memory effect with a onedimensional rough dielectric film on a glass substrate.

Angular correlation properties of 2D‐nano‐roughness‐induced speckle patterns for silica‐on‐silicon wafers

“…The speckle pattern is obtained by direct illumination of the CCD camera, without the use of an optical objective. This approach experimentally differs from previous similar experiments [9,10]. As summarized in [14], every pixel composing the speckle pattern in our case is an average of scattering contributions from all the surface elements illuminated by the laser.…”

“…However, all configurations lead to maximal values for the peak of correlation ranging from 0.5 to 0.8 depending on sample and polarization. In [10], the difference between the correlation peak value and unity was attributed to experimental alignment. A technique similar to the one presented in [15] was used to account for angular misalignment by numerically matching the two speckle patterns considered to obtain the maximum value of correlation achievable.…”

“…In section 3, results obtained for the memory and time-reverse memory effects are presented and discussed. Investigations concerning another type of intensity correlation, namely C (10) , are reported. The present study does not deal with theoretically demonstrated higherorder correlations [7] or so-called degenerate optical memory effect [8].…”

“…Experimental observation of C (1) [9] with mono-dimensional roughness and C (10) [10] with 2D-roughness were reported for the case of a dielectric layer over a glass substrate, with the sample being wedgeshaped to avoid reflection from the substrate to lie in the plane of incidence.…”

“…The contributions to these spatial correlations are divided into terms of short-range, C (1) and C (10) , long-range, C (1.5) and C (2) , and infinite-range correlation, C…”