Abstract

Anisotropic helical structures in Fabry–Perot (FP) cavities are shown to exhibit unique properties. The FP peaks are unpolarized, consisting of doublets corresponding to Bloch–Lyaponov eigenwaves with increased splitting as the local anisotropy increases and as they become closer to the photonic bandgap. The Bragg-type selective reflection peak existing in a free-cavity sample is inhibited when the helical medium is inside a cavity, and it has no effect on the cavity modes. Hence the unique characteristics are obtained even with a single period of the helix, and consequently thin films of helical liquid crystals can be used to build fast tunable polarization insensitive FP filters.

© 2006 Optical Society of America

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