Martin-Cano D, Nesterov M L, Fernandez-Dominguez A I, Garcia-Vidal F J, Martin-Moreno L, Moreno Esteban
Departamento de Fisica Teorica de la Materia Condensada, Universidad Autonoma de Madrid, Madrid, Spain.
Opt Express. 2010 Jan 18;18(2):754-64. doi: 10.1364/OE.18.000754.
A new approach for the spatial and temporal modulation of electromagnetic fields at terahertz frequencies is presented. The waveguiding elements are based on plasmonic and metamaterial notions and consist of an easy-to-manufacture periodic chain of metallic box-shaped elements protruding out of a metallic surface. It is shown that the dispersion relation of the corresponding electromagnetic modes is rather insensitive to the waveguide width, preserving tight confinement and reasonable absorption loss even when the waveguide transverse dimensions are well in the subwavelength regime. This property enables the simple implementation of key devices, such as tapers and power dividers. Additionally, directional couplers, waveguide bends, and ring resonators are characterized, demonstrating the flexibility of the proposed concept and the prospects for terahertz applications requiring high integration density.
本文提出了一种用于太赫兹频率电磁场时空调制的新方法。波导元件基于等离子体和超材料概念，由从金属表面突出的易于制造的周期性金属盒形元件链组成。结果表明，相应电磁模式的色散关系对波导宽度相当不敏感，即使在波导横向尺寸处于亚波长范围时，也能保持紧密约束和合理的吸收损耗。这一特性使得诸如渐变器和功率分配器等关键器件的简单实现成为可能。此外，还对定向耦合器、波导弯曲和环形谐振器进行了表征，展示了所提出概念的灵活性以及对高集成密度太赫兹应用的前景。
