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Artificial anisotropy and polarizing filters.
François Flory1, Ludovic Escoubas, Basile Lazaridès
1Institut Fresnel, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 6133, Ecole Nationale Supérieure de Physique de Marseille, Domaine Universitaire de Saint Jérĵme, France. francois.flory@fresnel.fr
Applied Optics
|June 18, 2002
Summary
Researchers calculated the effective index of multilayer mirrors using spectral transmittance. They measured artificial anisotropy in photoresist thin films, discussing homogenization theory limitations and designing polarizing coatings and polarization rotators.
Area of Science:
- Optics and Photonics
- Materials Science
- Thin Film Technology
Background:
- Multilayer laser mirrors are crucial optical components.
- Understanding the effective optical properties of thin films is essential for designing advanced optical devices.
- Artificial anisotropy in thin films can be engineered for specific optical functionalities.
Purpose of the Study:
- To determine the effective index of a single layer equivalent to a multilayer stack.
- To measure the artificial anisotropy of photoresist thin films with subwavelength gratings.
- To discuss the limitations of first-order effective index homogenization theory.
- To design novel polarizing coatings and polarization rotators.
Main Methods:
- Calculating spectral transmittance of multilayer laser mirrors.
- Measuring artificial anisotropy of photoresist thin films fabricated using interference fringes.
- Analyzing and discussing the effective index homogenization theory.
Main Results:
- The effective index of the multilayer stack was determined from its spectral transmittance.
- Artificial anisotropy was successfully measured in the fabricated photoresist thin films.
- Limitations of the first-order effective index homogenization theory were identified.
- Normal-incidence polarizing coatings and polarization rotators were designed.
Conclusions:
- The effective index of multilayer stacks can be accurately determined using spectral transmittance.
- Engineered anisotropic thin films offer a pathway to novel optical device designs.
- The study provides insights into the effective medium theory for subwavelength structures.