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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 18492–18500

All-optically controllable and highly efficient scattering mode light modulator based on azobenzene liquid crystals and poly(N-vinylcarbazole) films

Yen-Chen Liu, Ko-Ting Cheng, Yuan-Di Chen, and Andy Ying-Guey Fuh  »View Author Affiliations

Optics Express, Vol. 21, Issue 15, pp. 18492-18500 (2013)

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The present study reports that isothermal phase transition induced by photoisomerization of azobenzene liquid crystals (azo-LCs) from trans- to cis-isomers results in the dissolution of poly(N-vinylcarbazole) (PVK) into azo-LCs. Transparent (scattering) states can be demonstrated using uniform (rough) morphologies of PVK generated by slow (rapid) phase separation of PVK and azo-LCs from cis- to trans-isomers. The PVK films were examined in detail using scanning electron microscopy. Scattering performance resulting from the rough PVK surface induced micron-sized LC domains, and transparent performance resulting from the reformed uniform PVK surface can be optically and reversibly switched. Finally, all-optically controllable and highly efficient (contrast ratio of 370:1) scattering mode light modulators based on azo-LCs and PVK films were demonstrated.

© 2013 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(160.5470) Materials : Polymers
(230.0230) Optical devices : Optical devices

ToC Category:
Optical Devices

Original Manuscript: June 11, 2013
Revised Manuscript: July 19, 2013
Manuscript Accepted: July 20, 2013
Published: July 25, 2013

Yen-Chen Liu, Ko-Ting Cheng, Yuan-Di Chen, and Andy Ying-Guey Fuh, "All-optically controllable and highly efficient scattering mode light modulator based on azobenzene liquid crystals and poly(N-vinylcarbazole) films," Opt. Express 21, 18492-18500 (2013)

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