Rough surface scattering using a source able to produce an incident beam with controlled polarization and coherence

Area of Science:

• Optics and Photonics
• Surface Science
• Computational Physics

Background:

• Characterizing rough surfaces is crucial in various scientific and industrial applications.
• Traditional methods for analyzing light scattering often require extensive angular scanning, increasing complexity and time.
• Developing advanced light sources and analysis techniques is essential for efficient surface characterization.

Purpose of the Study:

• To present the first numerical and experimental results for light scattering from rough surfaces using a novel variable coherence polarimetry source.
• To demonstrate the application of this source for analyzing a 1D rough surface and retrieving surface information.
• To validate the source's capability by comparing numerical calculations with experimental measurements.

Main Methods:

• Utilized a variable coherence polarimetry source with a liquid-crystal phase modulator to control polarization and coherence.
• Employed a spatial light modulator to manipulate the polarization state distribution, creating scanned source spots.
• Analyzed the scattered light using a Stokes polarimeter and employed the Kirchhoff approximation for numerical scattering calculations.

Main Results:

• Successfully applied the variable coherence polarimetry source to a 1D rough surface, demonstrating its utility.
• Retrieved useful information about the surface by analyzing the scattered light field.
• Achieved good agreement between numerical simulations and experimental results, particularly in calculating intensity maxima during source spot scanning.

Conclusions:

• The developed variable coherence polarimetry source is effective for analyzing light scattering from rough surfaces.
• This technique offers a method to obtain surface information without the need for incidence or scatter angle scanning.
• The demonstrated agreement validates the numerical approach and the experimental setup for rough surface characterization.