Diffusive reflections in chiral photonic crystals on nanoimprinted CYTOP films

Heetae Ahn; Sooyeon Bae; Na Young Ha

doi:10.1117/12.2567393

20 August 2020 Diffusive reflections in chiral photonic crystals on nanoimprinted CYTOP films

Heetae Ahn, Sooyeon Bae, Na Young Ha

Proceedings Volume 11472, Liquid Crystals XXIV; 1147216 (2020) https://doi.org/10.1117/12.2567393
Event: SPIE Organic Photonics + Electronics, 2020, Online Only

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Abstract

Cholesteric liquid crystals (CLCs) with periodical helical structures of nematic molecules are chiral photonic crystals that exhibit photonic band gaps for circularly polarized lights with same handedness as CLC helices. We investigated optical characteristics of CLCs on nanoimprinted CYTOP films. Here, nanoimprinted CYTOP films are used as alignment layers to control orientations of cholesteric helices because of its strongly hydrophobic surface with low polarity and low polarizability. The CLCs on the nanoimprinted films showed not specular but diffusive reflections at the specific spectral region. This nanostructured CYTOP film can provide new possibility to engineer optical characteristics of the CLCs.

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Heetae Ahn, Sooyeon Bae, and Na Young Ha "Diffusive reflections in chiral photonic crystals on nanoimprinted CYTOP films", Proc. SPIE 11472, Liquid Crystals XXIV, 1147216 (20 August 2020); https://doi.org/10.1117/12.2567393

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