Eﬀect of cell thickness on the electro-optic response of polymer stabilized cholesteric liquid crystals with negative dielectric anisotropy

Kyung Min Lee; Ecklin P. Crenshaw; Mariacristina Rumi; Timothy J. White; Timothy J. Bunning; Michael E. McConney

doi:10.1117/12.2568117

20 August 2020 Eﬀect of cell thickness on the electro-optic response of polymer stabilized cholesteric liquid crystals with negative dielectric anisotropy

Kyung Min Lee, Ecklin P. Crenshaw, Mariacristina Rumi, Timothy J. White, Timothy J. Bunning, Michael E. McConney

Author Affiliations +

Proceedings Volume 11472, Liquid Crystals XXIV; 1147217 (2020) https://doi.org/10.1117/12.2568117
Event: SPIE Organic Photonics + Electronics, 2020, Online Only

Conference Poster

Abstract

As previously reported, direct current (DC) electric field can be used to control the photonic properties of polymer-stabilized cholesteric liquid crystals (PSCLCs) with negative dielectric anisotropy, such as the position and bandwidth modulation of the selective reﬂection notch. This dynamic EO response of PSCLCs is explained by the ﬁeld-induced deformation of the polymer stabilized networks mediated by ionic charges trapped in the polymer networks. In this poster, we report the effect of cell thickness on electro-optic response for relatively thin PSCLC samples (≤5 μm). Increasing the DC ﬁeld strength shifts the reﬂection notch to longer wavelength (red shifting tuning) and eventually disappears at high DC ﬁelds. The tuning range is dependent on the cell thickness. The reversible transition from reﬂective to clear state is due to an electrically driven chirp in the pitch across the small cell gap.

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Kyung Min Lee, Ecklin P. Crenshaw, Mariacristina Rumi, Timothy J. White, Timothy J. Bunning, and Michael E. McConney "Eﬀect of cell thickness on the electro-optic response of polymer stabilized cholesteric liquid crystals with negative dielectric anisotropy", Proc. SPIE 11472, Liquid Crystals XXIV, 1147217 (20 August 2020); https://doi.org/10.1117/12.2568117

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