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Electrically controlled optical bandgap in a structurally chiral material |
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| Authors: | J. Adrian Reyes Akhlesh Lakhtakia |
| Affiliation: | a Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Apartado Postal 20-364, C.P. 01000, Mexico D.F., Mexico b Computational and Theoretical Materials Sciences Group (CATMAS), Department of Engineering Science and Mechanics, Pennsylvania State University, 212 EES Building, University Park, PA 16802-6812, USA c Photonics Section, Department of Physics, Imperial College, London SW7 2AZ, United Kingdom |
| Abstract: | The propagation of light along the axis of non-homogeneity of a structurally chiral medium (SCM) under the influence of a low-frequency (dc) electric field aligned along the same axis is investigated. The Pockels effect is assumed to occur, and the SCM is taken to possess locally a  point group symmetry. The frequency-domain Maxwell curl equations are cast in a 4 × 4 matrix representation, and the Oseen transformation is invoked. The band structure is analyzed, as are also the eigenvectors as well as the transfer matrix. Finally, the reflection and transmission of a plane wave due to a SCM of finite thickness is considered. The low-frequency electric field is shown to control the bandgap. |
| Keywords: | 78.20.Ek 78.20.Fm 78.20.Jq |
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