Ion-beam induced liquid crystal alignment on diamond-like carbon and fluorinated diamond-like carbon thin films

Han Jin Ahn, Soon Joon Rho, Kyung Chan Kim, Jong Bok Kim, Byoung Har Hwang, Chang Joon Park, Hong Koo Baik

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Homogeneous and homeotropic orientations of nematic liquid crystal (NLC) are investigated on various inorganic thin films which are exposed to Ar ion-beam. It is the novel investigations which results in a completely dry processing technique for both the thin film deposition and alignment steps. In the case of homogenous alignment on diamond-like carbon (DLC) layer, optical band gap and the polar surface energy are investigated in order to elucidate the alignment mechanism by ion beam (IB) irradiation. We elucidate the role of surface polarity in DLC films with respect to the LC orientation. On the other hand, FDLC thin films are selected by homeotropic alignment layer with regard to the relationship between surface tension and LC orientation. Selected pretilt angles in the range of 71.1-89.8° can be easily obtained with ion beam irradiation. It is sensitively changed by thin films composition and the angle of ion beam irradiation.

Original languageEnglish
Pages (from-to)4092-4097
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number6 A
DOIs
Publication statusPublished - 2005 Jun 1

Fingerprint

Carbon films
Liquid crystals
Ion beams
Diamonds
diamonds
ion beams
liquid crystals
alignment
Thin films
Carbon
carbon
Irradiation
thin films
irradiation
Diamond like carbon films
Nematic liquid crystals
Optical band gaps
Interfacial energy
surface energy
Surface tension

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Ahn, Han Jin ; Rho, Soon Joon ; Kim, Kyung Chan ; Kim, Jong Bok ; Hwang, Byoung Har ; Park, Chang Joon ; Baik, Hong Koo. / Ion-beam induced liquid crystal alignment on diamond-like carbon and fluorinated diamond-like carbon thin films. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2005 ; Vol. 44, No. 6 A. pp. 4092-4097.
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Ion-beam induced liquid crystal alignment on diamond-like carbon and fluorinated diamond-like carbon thin films. / Ahn, Han Jin; Rho, Soon Joon; Kim, Kyung Chan; Kim, Jong Bok; Hwang, Byoung Har; Park, Chang Joon; Baik, Hong Koo.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 44, No. 6 A, 01.06.2005, p. 4092-4097.

Research output: Contribution to journalArticle

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AU - Ahn, Han Jin

AU - Rho, Soon Joon

AU - Kim, Kyung Chan

AU - Kim, Jong Bok

AU - Hwang, Byoung Har

AU - Park, Chang Joon

AU - Baik, Hong Koo

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