金属异质波导阵列中的表面等离激元传播特性

提出了一种新的一维金属异质波导阵列的设计方案,即波导芯区周期调制的金属波导阵列.数值模拟的结果表明,金属波导芯区的周期调制引起波导中传播的表面等离激元有效折射率的周期调制,从而可在特定的波段打开一个表面等离激元带隙(如1550nm附近).通过引入合适的缺陷波导单元,可获得特定波长的高品质因子(Q=556)的表面电磁模共振.这一结果可用于设计亚波长的布拉格反射器、光发射器、滤波器等,有可能被用于未来的集成光路.

Propagation Characteristics of Surface Plasmon Polaritons in a Metal Heterowaveguide Array

A new scheme of one-dimensional metal heterowaveguide array is proposed that the core layer of the metal waveguide is periodically modulated. Numerical results reveal that, periodic modulation of the core layer of metal waveguide induces the periodic modulation of the effective refraction index of the surface plasmon polaritons (SPP) in the waveguide, which opens up an SPP band gap around a certain waveband, such as waveband around 1550 nm. Further numerical results reveal that, the SPP mode resonance with high quality for example Q=556 can be obtained at some wavelength by introducing a proper defect waveguide layer. The results can be applied to the subwavelength Bragg reflectors, light emitters and filters, and could be also availabe for the future integrated optics.