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4 January 2008 Optical modulator using silicon photonic crystals/nano-montmorillonite
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In this paper, a novel compact optical modulator based on silicon photonic crystals /nano-montmorillonite is proposed. The two-dimensional silicon photonic crystal with triangular lattice and a line defect waveguide formed by a missing row of air holes in the Γ -K direction. The lattice constant is a, and the diameter of the holes is d=0.4a. The holes are filled with the nano-montmorillonite electrorheological fluid, which is made of nanometer sized nano-montmorillonite. The light modulation mechanism of the novel modulator is based on a dynamic shift of the photonic band gap. We have investigated its light modulation performance by using the finite-difference time-domain method. The numerical results show that an excellent optical modulator at a wavelength of 1550nm is achieved. The novel modulator has a high extinction ratio (close to -40dB) and small size (around 10μm). It is very suitable for forthcoming photonic integrated circuits.
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Jiu-sheng Li, Jian-rui Li, and Xiu-ming Wang "Optical modulator using silicon photonic crystals/nano-montmorillonite", Proc. SPIE 6831, Nanophotonics, Nanostructure, and Nanometrology II, 68311F (4 January 2008);


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