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10 May 2007 Theoretical study of ferroelectric barium-strontium-titanate-based one-dimensional tunable photonic crystals
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Tunable photonic crystals (PCs) have attracted much attention in the past decade because of their various applications such as ultra-fast optical filters and optical waveguides with add-drop functionalities. A common means of tuning PC is by changing the refractive indices of the constituent materials via the linear or quadratic electro-optic effect, which leads to a shift of the bandgap positions of the PC. The lead-free material, barium strontium titanate (BST), has a high quadratic electro-optic coefficient comparable to lanthanum-modified lead zirconate titanate (PLZT), and is a promising candidate as a lead-free tunable PC. Here we present a study on the feasibility of developing a one-dimensional tunable PC based on a BST and magnesium oxide (MgO) multilayer structure. The bandgap diagram of the PC structure is calculated using the plane-wave expansion (PWE) method. For a 1% change in the refractive index of BST, a 0.99% frequency shift in the bandgap can be achieved. It corresponds to a wavelength shift of 15.4 nm at a wavelength of 1550nm. Design of a tunable optical filter at a wavelength of 1550nm based on a BST/MgO 1D PC is suggested. The transmission property of the 1D PC is further verified by simulation, using the transfer matrix method (TMM).
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. L. Jim, D. Y. Wang, C. W. Leung, C. L. Choy, and H. L. W. Chan "Theoretical study of ferroelectric barium-strontium-titanate-based one-dimensional tunable photonic crystals", Proc. SPIE 6556, Micro (MEMS) and Nanotechnologies for Defense and Security, 65560R (10 May 2007);

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