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Goos-Hänchen shift for a rough metallic mirror.

M Merano¹, J B Götte, A Aiello

¹Huygens Laboratory, Leiden University, Leiden, The Netherlands. merano@molphys.leidenuniv.nl

|June 25, 2009

Summary

The Goos-Hänchen shift is affected by microscopic metal surface roughness but not by large-scale non-flatness. This finding aids in understanding light behavior at interfaces.

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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.