Resistance of a helical photonic structure band gap to partial disordering
E.R. Bukhanov, A.V. Shabanov, L.E. Tyryshkina, N.V. Rudakova, D.P. Fedchenko, I.V. Timofeev
Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, Kirensky Institute of Physics Federal Research Center, Krasnoyarsk, Russia
Keywords: helical photonic structure, partial disordering, circular Bragg’s phenomenon
Abstract
The helical symmetry of a permittivity tensor causes Bragg’s reflection at wavelengths close to the screw (helicoid) pitch for circular polarization of light. The study has discovered and explained the resistance of a band gap short-wave boundary to the optical axis tilt towards helical axis (normal to the plane of layers) in helical photonic structures. For a conical helical structure, the long-wavelength boundary of the reflection area changes more than for a structure with a normal cone opening with optical axis perpendicular to helical axis. Still, the wavelength for the edge mode at the short-wave boundary strictly remains under arbitrary distortions. The findings of a numerical simulation with the use of anisotropic transfer matrix and Berreman transfer matrix are coherent and confirmed by analytical derivation.
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