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Narrowband and ultranarrowband filters with electro-optic structurally chiral materials

Akhlesh Lakhtakia
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Abstract

When a circularly polarized plane wave is normally incident on a slab of a structurally chiral material with local $\bar{4}2m$ point group symmetry and a central twist defect, the slab can function as either a narrowband reflection hole filter for co-handed plane waves or an ultranarrowband transmission hole filter for cross-handed plane waves, depending on its thickness and the magnitude of the applied dc electric field. Exploitation of the Pockels effect significantly reduces the thickness of the slab.

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Akhlesh Lakhtakia. 2006-06-04. Narrowband and ultranarrowband filters with electro-optic structurally chiral materials. https://arxiv.org/abs/physics/0606031

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