基于表面等等离波子的新型Y分支波导

新型高效的纳米光波导器件的研制纳米集成光学的核心技术之一。Y分支波导作为最基本的分光和光路连接元件是纳米光学器件设计与制备的基础。运用时域有限差分(FDTD)法,模拟计算了基于表面等等离波子(SPP)的纳米Y分支波导的传输特性。结果表明,该新型Y分支波导在光通信波段可以实现大角度的分光功能,且在180°分支情况下,传输效率仍高达92.8%以上。另外,该波导还具有导波性能良好、对分叉处间隙缺陷大小不敏感及制作容差较大和器件尺寸在纳米量级等特点。对该新型光波导器件的研究为未来纳米集成光学器件的研制和应用有一定的指导意义。

A Novel Y-Branch Waveguide Based on Surface Plasmon Polaritons

A key technique of nano-integrated optics is the development of novel and highly efficient nano-scale waveguide devices. As a basic optical splitting and light-connecting device, nano-scale Y-branch waveguide is the basis of designing and developing nano-scale optical devices. A novel Y-branch waveguide based on surface plasmon polaritons (SPPs) is proposed for high integration, and the finite-difference time-domain (FDTD) method is used to study its propagation properties. The simulation results show that the proposed Y-branch waveguide realizes optical splitting with large splitting angle in the optical communication band, and the transmission efficiency is still over 92.8% for 180° splitting angle. Besides, it is characterized by its nano-scale size, guiding wave with good performance being insensitive to the defect at the joint of the splitter, and large tolerance. The study of the novel waveguide devices can offer some valuable guidances to the research and application of nano-integration devices.