Abstract

We numerically investigate the photonic bandgaps as well as the transmission properties of a two-dimensional magnetic photonic crystal (PC) in the terahertz (THz) region by the plane wave expansion and finite-difference time-domain methods. The calculation predicts a magnetic PC waveguide that can work as a tunable filter with a bandwidth larger than $0.1\mathrm{THz}$, and its central frequency is from 0.83 to $1.03\mathrm{THz}$. It also shows that a magnetic PC can be used as a polarization controller with three functions, including controllable polarizing, polarization beam splitting, and $-\pi –\pi$ phase shifting.

© 2011 Optical Society of America

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