Abstract
In order to design an optical polarizer, the linear birefringence effect of uniaxial anisotropic materials is utilized to break the degeneracy of the TM and TE resonances in a defected one-dimensional photonic crystal. A broadband performance is achieved by introducing and engineering the multiple-defect structures. Consequently, compact broadband TM mode polarizers are proposed and numerically analyzed to demonstrate the good performance in the long-wavelength communication band (C-band). A <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$6.7~\mu \text{m}$ </tex-math></inline-formula> long double-defect polarizer is proposed with polarization extinction ratio (PER) greater than 27.27 dB and a ripple-free insertion loss (IL) less than 0.22 dB over an operational bandwidth (BW) of 17 nm. In addition, a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$9.3~\mu \text{m}$ </tex-math></inline-formula> long triple-defect polarizer is designed with PER>31.31 dB, IL< 0.22 dB, and a ripple factor of 2.8% over a wide BW of 34.2 nm.
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