Superior optical properties of homogeneous liquid crystal alignment on a tin (IV) oxide surface sequentially modulated via Ion Beam irradiation

Young Gu Kang, Hong Gyu Park, Hyungjun Kim, Young Hwan Kim, Byeong Yun Oh, Byoung Yong Kim, Dai Hyun Kim, Dae-Shik Seo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We first investigated the alignment characteristics of tin (IV) oxide (SnO2) thin films deposited by radio-frequency (RF) magnetron sputtering. This study demonstrates that liquid crystal (LC) molecules could be aligned homogeneously by controlling the Ion Beam (IB) irradiation energy densities. We also show that the pretilt angle of the LC molecules has a close relation with the surface energy. X-ray photoelectron spectroscopy (XPS) indicates that a non-stoichiometric SnO2-x surface converted by ion beam irradiation can horizontally align the LC molecules. The measured electro-optical (EO) characteristics showed high performance, comparable with those of rubbed and ion-beam irradiated polyimide (PI) layers.

Original languageEnglish
Pages (from-to)21594-21602
Number of pages9
JournalOptics Express
Volume18
Issue number21
DOIs
Publication statusPublished - 2010 Oct 11

Fingerprint

tin
ion beams
liquid crystals
alignment
optical properties
irradiation
oxides
molecules
polyimides
surface energy
radio frequencies
magnetron sputtering
flux density
photoelectron spectroscopy
thin films
x rays

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Kang, Young Gu ; Park, Hong Gyu ; Kim, Hyungjun ; Kim, Young Hwan ; Oh, Byeong Yun ; Kim, Byoung Yong ; Kim, Dai Hyun ; Seo, Dae-Shik. / Superior optical properties of homogeneous liquid crystal alignment on a tin (IV) oxide surface sequentially modulated via Ion Beam irradiation. In: Optics Express. 2010 ; Vol. 18, No. 21. pp. 21594-21602.
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Superior optical properties of homogeneous liquid crystal alignment on a tin (IV) oxide surface sequentially modulated via Ion Beam irradiation. / Kang, Young Gu; Park, Hong Gyu; Kim, Hyungjun; Kim, Young Hwan; Oh, Byeong Yun; Kim, Byoung Yong; Kim, Dai Hyun; Seo, Dae-Shik.

In: Optics Express, Vol. 18, No. 21, 11.10.2010, p. 21594-21602.

Research output: Contribution to journalArticle

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AU - Kang, Young Gu

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