Waveguide resonance of subwavelength metallic slits

• 来源期刊: 中国物理（英文版）
• 关键词: electromagnetic wave propagation metallic subwavelength periodic slits waveguide resonance
• 年，卷（期）: 2007,（5）
• 页码范围: 1315-1319
• 页数: 5页
• 语种: 英文

摘要

The transmission characteristics of a metallic film with subwavelength periodic slits are investigated by using the two-dimensional finite-difference time-domain method (2D-FDTD). Two models are constructed to show the dependance of the transmission spectrum on the slit structure. A sandwiched structure is used to exhibit the contribution of the metallic wall inside slits to the extraordinary high transmission. And a filled slit structure is employed to reflect the relation between the average refractive index inside the slits and the transmission spectrum of the structure. The transmission characteristics of two structures can be explained well with the waveguide resonance theory.