Nematic liquid crystal optical channel waveguides on silicon

d’Alessandro, Antonio and Bellini , Bob and Donisi, Domenico and Beccherelli, Romeo and Asquini, Rita (2006) Nematic liquid crystal optical channel waveguides on silicon. IEEE Journal of Quantum Electronics , 42 (10). pp. 1084-1090. ISSN 0018-9197

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We demonstrate the first channel waveguides made of E7 nematic liquid crystal (LC) in SiO2–Si V-grooves. The grooves have been obtained by wet etching n-Si substrates first and then by thermally growing an approximately 2- m-thick SiO2 cladding layer. Propagation of infrared light at a wavelength of 1550 nm shows a good optical confinement in 10- m-wide LC waveguides. Modal analysis and beam propagation simulations predict single mode propagation. This is experimentally confirmed by the acquired near field images. The optical waveguide acts as an integrated optic polarizer, since only vertical polarization can propagate due to the orientation of the LC molecules. The horizontal polarization state is suppressed by more than 25 dB.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 500.2 Scienze fisiche
Depositing User: Danilo Dezzi
Date Deposited: 02 Jan 2013 13:07
Last Modified: 20 Mar 2013 14:58

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