Speckle correlations around the backscattering direction in the double-passage configuration

Area of Science:

• Optics and Photonics
• Wave Phenomena
• Statistical Optics

Background:

• Wave scattering through random media is crucial in various fields.
• Speckle patterns arise from interference of scattered waves.
• Double passage through a random screen introduces unique scattering characteristics.

Purpose of the Study:

• To experimentally investigate the angular correlation function of far-field speckle patterns.
• To verify theoretical predictions regarding speckle symmetry and motion.
• To validate the analysis by Escamilla et al. (1993) for wave propagation through a 1D random-phase screen.

Main Methods:

• Experimental setup for observing far-field speckle patterns.
• Utilizing a one-dimensional random-phase screen for wave scattering.
• Measuring the angular correlation function of speckle patterns.
• Analyzing speckle motion with source displacement.

Main Results:

• Experimental data aligns with theoretical predictions for speckle pattern symmetry.
• Observed speckle motion characteristics match the theoretical model.
• The angular correlation function exhibits properties consistent with double-passage scattering theory.

Conclusions:

• The study experimentally confirms the symmetry of speckle patterns around the backscattering direction.
• Experimental findings validate the theoretical description of speckle motion during source displacement.
• This work provides empirical support for the analysis of wave scattering in double passage through random media.