Goos-Hänchen shift for a rough metallic mirror

Area of Science:

• Physics
• Optics
• Surface Science

Background:

• The Goos-Hänchen shift describes the lateral displacement of a light beam upon reflection.
• Understanding factors influencing this shift is crucial for optical applications.

Purpose of the Study:

• To experimentally investigate how surface properties of an air-metal interface affect the Goos-Hänchen shift.
• To determine the influence of microscopic roughness versus large-scale non-flatness on the shift.

Main Methods:

• Experimental measurements of the Goos-Hänchen shift at an air-metal interface.
• Analysis of surface properties including microscopic roughness and large-scale variations.
• Application of an effective medium model for roughness.
• Utilizing Rayleigh-Rice theory for scattering phenomena.

Main Results:

• The Goos-Hänchen shift is dependent on the microscopic roughness of the metal surface.
• The shift is insensitive to large-scale surface variations or non-flatness.
• Experimental observations are consistent with theoretical models.

Conclusions:

• Microscopic surface topography is a key factor governing the Goos-Hänchen shift at air-metal interfaces.
• The findings provide insights into light-surface interactions and optical phenomena.
• This research contributes to the understanding of surface-dependent optical effects.