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Coupling of Rayleigh-Wood anomalies andthe circular Bragg phenomenon in slanted chiral sculptured thin films

Published online by Cambridge University Press:  25 October 2002

F. Wang ,
A. Lakhtakia  and
R. Messier
F. Wang*
Affiliation:
CATMAS – Computational and Theoretical Materials Sciences Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812, USA
A. Lakhtakia
Affiliation:
CATMAS – Computational and Theoretical Materials Sciences Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812, USA
R. Messier
Affiliation:
CATMAS – Computational and Theoretical Materials Sciences Group, Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802-6812, USA
*
[email protected][email protected][email protected]
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Abstract

Slanted chiral sculptured thin films (STFs) are introduced as nano-engineered materials that are effectively periodic in two orthogonal directions. Their periodicities normal and parallel to the substrate plane are related by a slant angle. A coupled wave theory is formulated and implemented for the planewave response of a slanted chiral STF of finite thickness. Numerical results show that the nonspecular remittances and the Rayleigh-Wood anomalies due to periodicity parallel to the substrate plane are tightly coupled to the specular nature of the circular Bragg phenomenon displayed due to periodicity normal to the substrate plane. In the Bragg regime, the left- and the right-circularly polarized components of the incident plane wave are redirected in non-trivially different directions. The potential of slanted chiral STFs as narrowband circular polarization beamsplitters is established.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 20 , Issue 2: Instrumentation Interdisciplinary Colloque (C2I 2001) , November 2002 , pp. 91 - 103
Copyright
© EDP Sciences, 2002

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