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Proceedings Paper

Fast electro-optic liquid crystal switch and attenuator with large extinction ratio at 1550 nm
Author(s): Oliver Hadeler; Mikhail N. Pivnenko; Marcus J. Coles; Martin Grasmann; Jonathan P. Hannington; Terry V. Clapp; Jon V DeGroot; Harry James Coles
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Paper Abstract

We demonstrate an electro-optic switch and a variable attenuator for telecommunication applications at λ=1550nm by employing the ferroelectric and electroclinic properties of an organosiloxane liquid crystal. In the ferroelectric SmC* phase an optical switch has been realised with an extinction ratio of 36dB between crossed polarisers. The switching time was ~200microseconds. In the SmA* phase the analogue nature of the electroclinic effect was employed to obtain a variable attenuator. The maximum attenuation range between crossed polarisers was 35dB for an applied electric field of +-9V/micron. The response time of the device was about 100microseconds, independent of the applied electric field. Both devices where demonstrated in the same 21.5micron thick cell which provided a retardance of λ/2 at λ=1550nm.

Paper Details

Date Published: 12 April 2005
PDF: 6 pages
Proc. SPIE 5741, Emerging Liquid Crystal Technologies, (12 April 2005); doi: 10.1117/12.593106
Show Author Affiliations
Oliver Hadeler, Univ. of Cambridge (United Kingdom)
Mikhail N. Pivnenko, Univ. of Cambridge (United Kingdom)
Marcus J. Coles, Univ. of Cambridge (United Kingdom)
Martin Grasmann, Dow Corning Corp. (United States)
Jonathan P. Hannington, Dow Corning Corp. (United States)
Terry V. Clapp, Dow Corning Corp. (United States)
Univ. of Cambridge (United Kingdom)
Jon V DeGroot, Dow Corning Corp. (United States)
Harry James Coles, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 5741:
Emerging Liquid Crystal Technologies
Liang-Chy Chien, Editor(s)

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