Direct optical observation of walls and disclination effects in active photonic devices

Snow, B.D. and Adikan, Faisal Rafiq Mahamd and Gates, J.C. and Gawith, C.B.E. and Dyadyusha, A. and Major, H.E. and Kaczmarek, M. and Smith, P.G.R. (2009) Direct optical observation of walls and disclination effects in active photonic devices. Molecular Crystals and Liquid Crystals, 502. pp. 178-184. ISSN 1542-1406

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Abstract

Liquid crystal tunable Bragg Gratings defined in planar substrates via a laser patterning technique exhibit complex wavelength tuning. This tuning displays threshold points and hysteresis. These tuning features are shown to be a manifestation of physical processes occurring in the confined geometry of our tunable devices. Such physical processes include the formation and removal of line disclinations and an associated wall. We discuss the effect of walls in the liquid crystal with regards to voltage tuning characteristics and whether they may allow faster wavelength tuning.

Item Type: Article
Additional Information: Snow, B. D. Adikan, F. R. M. Gates, J. C. Gawith, C. B. E. Dyadyusha, A. Major, Huw E. Kaczmarek, M. Smith, P. G. R. 2nd International Workshop on Liquid Crystals for Photonics Jul 20-22, 2008 Cambridge, ENGLAND
Uncontrolled Keywords: Bragg gratings liquid crystals optics wave-guides
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Mr. Mohammed Salim Abd Rahman
Date Deposited: 06 Feb 2013 02:55
Last Modified: 11 Oct 2018 01:45
URI: http://eprints.um.edu.my/id/eprint/4674

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