Variable liquid crystal pretilt angles on various compositions of alignment layers

Jong Bok Kim, Kyung Chan Kim, Han Jin Ahn, Byoung Har Hwang, Dong Choon Hyun, Hong Koo Baik

Research output: Contribution to journalArticle

53 Citations (Scopus)


The authors introduce variable liquid crystal (LC) pretilt angles via ion beam (IB) irradiation of silicon carbide (SiC) layers of various compositions. To control the composition of the SiC layer, the authors altered the rf power ratio between the graphite target and silicon target. The pretilt angle of the silicon-rich SiC layer was constant regardless of IB irradiation angle; however, the carbon-rich SiC layer showed variable pretilt angles, depending on IB irradiation angle. The authors attribute variable pretilt angle to the competition between van der Waals interactions, favoring the vertical alignment, and pi-pi interactions, favoring the LC alignment parallel to IB direction.

Original languageEnglish
Article number043515
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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