基于半导体纳米线和金属脊的混合表面等离子体波导模式特性分析

Mode Properties of Hybrid Plasmonic Waveguide Based on Semiconductor Nanowire and Metal Ridge

设计了由半导体纳米线和半圆顶金属脊组成的混合表面等离子体波导.通过有限元法对这种波导所支持混合模式的深亚波长局域、传播损耗等特性进行了数值计算.结果表明,在工作波长为1.55μm的情况下,混合模式的最小模面积仅为0.001 81(λ2/4),同时保持20μm的传播距离;与同类结构波导相比具有模场面积小,光传播距离远等优点,在光子集成元器件及光子集成电路等领域具有潜在应用价值.

A hybrid plasmonic waveguide that consists of a semiconductor nanowire and semicircular-top metal nanoridge was proposed. Finite element method was used to numerically evaluate hybrid mode＇ s deep subwavelength field confinement and propagation loss etc. Simulation results reveal that mode area of 0. 001 81（22/4） and propagation distance of 20 μm are obtained at the wavelength of 1.55 μm; the proposed waveguide has advantages of smaller mode area and longer propagation distance over other similar structures that has potential in fabrication of integrated photonic components and circuits.