亚波长周期性各向异性金属薄膜的等离子体共振特性
Resonance properties of surface plasma of sub-wavelength periodic perforated anisotropic metal film
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摘要: 基于各向异性模型，运用全矢量的3维时域有限差分法（FDTD），研究了在外磁场作用下，亚波长周期性各向异性金属薄膜的表面等离子体共振机制和特性,即由周期性穿孔形成的局域波导共振和由周期性结构引起的光子晶体共振效应。研究发现:当薄膜厚度一定时，两种等离子体共振模式都会随着外磁场的增大而向短波方向移动；而当外磁场一定、薄膜变厚时，周期结构因素引起的共振传输峰向长波方向转移，波导共振传输峰向短波方向转移;通过调控外加磁场的大小或方向可控制光通过金属薄膜的增强传输效应。
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关键词:
- 各向异性金属膜 /
- 表面等离子体 /
- 全矢量时域有限差分法 /
- 共振传输
Abstract: The resonance mechanism and characteristics of surface plasma in the anisotropic metal film with a periodic array of sub-wavelength holes are investigated under external magnetic field adopting the anisotropic model and full-vector 3-D finite-difference time-domain (FDTD) method. There are two resonance modes: localized waveguide resonance from the period rectangular hole array and photonic crystal resonance from the periodic structures. It is found that both the resonance modes shift towards shortwave region with the increasing of the applied magnetic field; the peak of the photonic crystal resonance shifts towards long-wave region, while the peak of the waveguide resonance transfers to short-wave region. In addition, the enhanced transmission effect might be controlled by adjusting the m -
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