Surface magnetoplasmons (SMPs) in a basic physical model for the terahertz regime, which consists of a semi-infinite magnetized semiconductor with dielectric cladding terminated by a metal slab, are theoretically investigated. The dispersion properties of such SMPs are analyzed and examined in detail. It is shown that SMPs may follow three different kinds of dispersion diagrams, depending on the applied dc magnetic field intensity. Complete one-way propagation that operates within the band gap of the semiconductor is available for SMPs, and the one-way bandwidth reaches a maximum at a certain magnetic field intensity. Regular modes guided by the dielectric layer are also analyzed. These modes may cause the (complete) SMP one-way region to be compressed or even removed, but they can be suppressed by reducing the dielectric layer thickness. Owing to the mirror effect of the metal slab, one-way propagating and backscattering-immune basic SMPs can exhibit a larger propagation length than those sustained by a single dielectric-semiconductor interface.

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Abstract-This paper presents a proposal of taking the left-handed material as the structural defects of one-dimensional photonic crystals and uses the transfer matrix method to analyze the band-gap of that structure. The simulation result shows that the structure investigated can be considered as a narrow pass band optical filter. By tuning the refractive index of the left-handed material, the ideal transmission rate in the pass band is as higher as 99.99%, while in the band-gap is lower than 0.01%. In addition, we show that the bandwidth can be increased by reducing the cycle number of the photonic crystals.

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A photonic crystal (PhC) cavity formed by a closed interface between a dielectric PhC and a magnetooptical (MO) material PhC is proposed and analyzed theoretically. It is shown that such a cavity can support one-way rotating modes and thus the modal fields at different frequencies have a similar pattern. The loss effect of MO material is taken into consideration for the solution of quality-factors for the cavity. The coupling between a cavity with one-way state and a PhC waveguide is also studied through numerical simulations. Simulation results show that cavity mode only interacts with the waveguide mode propagating in a particular direction. This work paves the way to control waveguide-cavity interaction.