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使用时域有限差分法,研究了各向异性特异材料(AMM)作为包层的AMM/介质/AMM波导中表面等离子体的共振性质.色散关系表明,当特异材料为负磁导率的always-cutoff型时,AMM/介质/AMM波导支持TE极化的表面等离子体,表面等离子体的波长随着中间介质层的厚度和特异材料磁等离子体频率的减小而变短.在有限长度AMM/介质/AMM波导中,由于两端界面的反射,表面等离子体模在波导中形成Fabry-Perot共振,而实现亚波长的表面等离子体微腔.在共振频率,电场强度在微腔的中部达到最大值,而磁场分别在两端界面处达到最大,电磁能强局域在中间介质层中,这一性质将在可调的具有强局域特性的亚波长微腔及腔量子电动力学中具有潜在的应用.
The resonant properties of surface plasmons in AMM / dielectric / AMM waveguides with anisotropy-specific material (AMM) cladding were studied by using finite-difference time-domain method. The dispersion relation shows that when the specific material is always- cutoff type, the AMM / dielectric / AMM waveguide supports TE-polarized surface plasmons whose wavelength decreases with the thickness of the intermediate dielectric layer and the decrease of the magnetic plasma frequency of the specific material.In a limited length AMM / In the medium / AMM waveguide, the surface plasmons form Fabry-Perot resonances in the waveguide due to the reflection of the two interfaces, so that the sub-wavelength surface plasmonic microcavities are achieved. At the resonant frequency, the electric field intensity reaches the maximum in the middle of the microcavity Value, and the magnetic field reaches the maximum at the two-terminal interface, respectively. The electromagnetic energy is locally localized in the intermediate dielectric layer and this property will have potential in tunable subwavelength microcavities with tunable local characteristics and cavity quantum electrodynamics Applications.