Origins of Kerr phase and orientational phase in polymer-dispersed liquid crystals

Chia Ming Chang, Yi Hsin Lin, Victor Reshetnyak, Chui Ho Park, Ramesh Manda, Seung Hee Lee

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10 Scopus citations

Abstract

Polymer-dispersed liquid crystals (PDLCs) modulate the amplitude and optical phase of light. The optical phase modulation of PDLC can be dissected into two parts: Kerr phase and orientational phase according to the electro-optical (EO) response. We investigated the origins of the Kerr and orientational phases in PDLCs and their connection with the two-step EO response. The Kerr phase is attributed to LC orientation in the center of LC droplets. The orientational phase results from orientation of LC molecules near LC–polymer interfaces. Both phases can be adjusted by varying the droplet size. The two-step EO response in small droplets (<333 nm) is related to the Kerr and orientational phases, and possibly to rotation of point defects. A modified PDLC model considering the Kerr and orientational phases is proposed. Our findings suggest the possibility of versatile photonic devices using pure optical phase modulation.

Original languageEnglish
Pages (from-to)19807-19821
Number of pages15
JournalOptics Express
Volume25
Issue number17
DOIs
StatePublished - 21 Aug 2017

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    Chang, C. M., Lin, Y. H., Reshetnyak, V., Park, C. H., Manda, R., & Lee, S. H. (2017). Origins of Kerr phase and orientational phase in polymer-dispersed liquid crystals. Optics Express, 25(17), 19807-19821. https://doi.org/10.1364/OE.25.019807