期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 42, 期 9-10, 页码 1084-1090出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2006.881827
关键词
integrated optic polarizers; liquid crystal (LC); optical waveguides; silicon photonics
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-mu m-thick SiO2 cladding layer. Propagation of infrared light at a wavelength of 1550 nm shows a good optical confinement in 10-mu 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.
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