Inch-scale graphene-based LC tunable phase retarders: Experimental study of surface interaction between liquid crystal-polyimide-graphene layers

Stefan Petrov, Vera Marinova, Ching Cherng Sun, Ken Yuh Hsu, Shiuan Huei Lin

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

Recently Liquid Crystal (LC) devices open new route for the next generation optical elements revealing on novel materials that come to a scene, among which graphene endorse amazing capabilities. Herein, we perform detailed study of the surface interaction between LC molecules, graphene (single and multilayer) and alignment layer during assembling tunable LC phase retarders on arbitrary substrates. By considering the surface free energy of graphene a proper selection of polyimide (PI) as a polar layer for non-contact planar alignment of LC molecules is presented. Surface anchoring energy and pre-tilt angle value have been determined to characterize the interfaces at the boundary and their impact on the dynamic performances of assembled LC devices. Besides the excellent phase modulation repeatability over the large-scale area of retrofitted LC structures, an electrically tunable LC phase retarder supported by graphene on PDMS substrate that exhibits great potential for future ITO-free integrated photonic devices and bio-oriented technologies is demonstrated.

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文章編號150646
期刊Applied Surface Science
566
DOIs
出版狀態已出版 - 15 11月 2021

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