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Proceedings Paper

Threaded-chiral media: reflectors for elliptically polarized light
Author(s): Ian J. Hodgkinson; Qi Hong Wu; Lakshman De Silva; Matthew Arnold
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Paper Abstract

Effective medium theory is applied to nanoengineered inorganic coatings in which a primary chiral medium (A) threads through a second medium (B) that may be isotropic, birefringent or chiral. In general A and B are represented by thin locally-birefringent layers with axes that rotate through the thickness of the coating. Local properties of the complex medium are represented by a Herpin birefringent period (A/2)B(A/2), with effective principal refractive indices and with thickness much less than the chiral period. The effect of changing the fraction fB of material B is considered. With simplicity of fabrication in mind, the special case in which A and B are identical apart from thickness and azimuthal orientation is developed. Then, by maintaining a constant optical thickness for the Herpin period, the circular Bragg resonant wavelength of the primary medium can be retained. As an example of the potential use of threaded-chiral materials, handed resonant reflectors for elliptically-polarized light are considered.

Paper Details

Date Published: 2 August 2004
PDF: 10 pages
Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.559144
Show Author Affiliations
Ian J. Hodgkinson, Univ. of Otago (New Zealand)
Qi Hong Wu, Univ. of Otago (New Zealand)
Lakshman De Silva, Univ. of Otago (New Zealand)
Matthew Arnold, Univ. of Otago (New Zealand)

Published in SPIE Proceedings Vol. 5508:
Complex Mediums V: Light and Complexity
Martin W. McCall; Graeme Dewar, Editor(s)

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