DocumentCode :
2730182
Title :
A novel approach to distributed feedback in liquid crystals
Author :
Donisi, Domenico ; Asquini, Rita ; Alessandro, Antonio D. ; Assanto, Gaetano
Author_Institution :
Dept. of Electron. Eng., Sapienza Univ. of Rome, Rome, Italy
fYear :
2009
fDate :
June 28 2009-July 2 2009
Firstpage :
1
Lastpage :
4
Abstract :
Nematic liquid crystals (NLC) consist of dielectrically anisotropic molecules in a fluid state; under proper anchoring at the boundaries of a cell, these elongated molecules tend to align, exhibiting a degree of orientational order and behaving as an optically birefringent uniaxial. NLC are transparent from the ultraviolet to the mid-infrared and exhibit a large electro-optic response. For these reasons, a number of configurations have been investigated for guided-wave devices in optical signal processing, with particular attention to voltage-tunable geometries and, among them, Bragg resonant structures. In this Communication we analyze a novel electro-optic distributed feedback waveguide encompassing full adjustability in degree of confinement and Bragg resonance wavelength using an externally applied voltage. We propose and numerically test the structure, demonstrating its operation as a wavelength-selective reflector and tunable drop-multiplexer.
Keywords :
birefringence; electro-optical effects; nematic liquid crystals; Bragg resonant structures; dielectrically anisotropic molecules; distributed feedback waveguide; electro-optic response; fluid state; nematic liquid crystals; optical signal processing; optically birefringent uniaxial; tunable drop multiplexer; wavelength selective reflector; Anisotropic magnetoresistance; Dielectric liquids; Distributed feedback devices; Geometrical optics; Liquid crystals; Optical feedback; Optical signal processing; Optical waveguides; Resonance; Voltage; Bragg reflectors; guided waves; liquid crystals;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Transparent Optical Networks, 2009. ICTON '09. 11th International Conference on
Conference_Location :
Azores
Print_ISBN :
978-1-4244-4825-8
Electronic_ISBN :
978-1-4244-4827-2
Type :
conf
DOI :
10.1109/ICTON.2009.5185206
Filename :
5185206
Link To Document :
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