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现代光学及纳米光学的一个主要发展趋势是从理论和实验两方面探究用于突破传统衍射极限的亚波长级别的电磁波波导结构。表面等离子激源提供了解决此问题的有效突破口。文中根据异质波导结构的耦合以及锲型波导的表面等离子激发理论,提出了异质纳米棒结构波导,该结构具有非常高的模场限制能力,对其传输的模式理论上可实现亚波长级别的限制能力。文中主要对此结构进行了数值仿真,分析了该波导结构的能量以及传输损耗,其结果表明该结构的模场限制能力可达到衍射极限的1/500,而且通过调整结构参数,将模场的传输距离延长到毫米级别。
A major development trend of modern optics and nanometer optics is to explore subwavelength electromagnetic waveguides used to break the traditional diffraction limit both theoretically and experimentally. Surface plasmon excitation provides an effective breakthrough to solve this problem. According to the coupling of heterogeneous waveguide structures and the surface plasmon excitation theory of wedge-shaped waveguides, a heterogeneous nanorod waveguide structure is proposed, which has a very high mode field limiting capability and can theoretically realize sub-wavelength levels The ability to limit. In this paper, the numerical simulation of this structure is mainly carried out. The energy and transmission loss of the waveguide structure are analyzed. The results show that the mode field limiting capability of this structure can reach 1/500 of the diffraction limit, and by adjusting the structural parameters, Transmission distance extended to the millimeter level.