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Absorbing beam splitter in a Michelson interferometer.

J J Monzón, L L Sánchez-Soto

|November 12, 2010

Summary

This study examines beam splitters with absorbing coatings, finding that their inherent asymmetry affects light reflection and transmission. This lack of reversibility is crucial for understanding their performance in optical instruments like interferometers.

Area of Science:

Optics and Photonics
Materials Science

Background:

Beam splitters are fundamental optical components.
Absorbing coatings on beam splitters can alter their optical properties.
Reversibility is a key characteristic of ideal optical systems.

Purpose of the Study:

To investigate the irradiance equality between reflected and transmitted light.
To analyze the absorption and phase difference in thin absorbing film beam splitters.
To explore the asymmetry introduced by the lack of reversibility in a Michelson interferometer setup.

Main Methods:

Theoretical analysis of light interaction with a thin absorbing film on a transparent plate.
Calculation of reflected and transmitted irradiances.
Phase difference analysis between reflected and transmitted optical fields.

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Main Results:

The study considers the conditions for equality of reflected and transmitted irradiances.
Quantification of absorption losses within the metallic film.
Characterization of the phase difference between the output optical fields.
Demonstration of asymmetry in a Michelson interferometer due to non-reversibility.

Conclusions:

Thin absorbing film beam splitters exhibit non-reciprocal behavior.
This asymmetry impacts the performance and interpretation of results in interferometric measurements.
Understanding these properties is essential for designing and utilizing such beam splitters effectively.