Abstract

Selective reflection of light by oblique helicoidal cholesteric (${\mathrm{Ch}}_{\mathrm{OH}}$) can be tuned in a very broad spectral range by an applied electric field. In this Letter, we demonstrate that the peak wavelength of the selective reflection can be controlled by the surface alignment of the director in sandwich cells. The peak wavelength is blue-shifted when the surface alignment is perpendicular to the bounding plates and red-shifted when it is planar. The effect is explained by the electric field redistribution within the cell caused by a spatially varying heliconical ${\mathrm{Ch}}_{\mathrm{OH}}$ structure. The observed phenomenon can be used in sensing applications.

© 2018 Optical Society of America

Electromagnetically tunable cholesterics with oblique helicoidal structure [Invited]

Oleg D. Lavrentovich
Opt. Mater. Express 10(10) 2415-2424 (2020)

Optical control of light polarization in heliconical cholesteric liquid crystals

G. Nava, R. Barboza, F. Simoni, O. Iadlovska, O. D. Lavrentovich, and L. Lucchetti
Opt. Lett. 47(12) 2967-2970 (2022)

Nonlinear optical propagation near the Bragg resonance in heliconical cholesteric liquid crystals

F. Simoni
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Reflection spectra of distorted cholesteric liquid crystal structures in cells with interdigitated electrodes

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Electro-thermally tunable reflective colors in a self-organized cholesteric helical superstructure

Po-Chang Wu, Guan-Wei Wu, Ivan V. Timofeev, Victor Ya. Zyryanov, and Wei Lee
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