论文部分内容阅读
设计了一种双正方形中空表面等离子体光波导(SPW)。采用频域有限差分法,对这种波导所支持的基模的传输特性进行了研究。结果表明,基模沿纵向的能流密度主要分布在双正方形空气芯的中心区域。通过调节2个正方形空气孔的边长、中心距离以及工作波长的大小,可以调节基模的场分布范围以及场与金属银相互作用的大小,从而调节有效折射率、传播距离和模式面积等传输特性。通过与双圆形中空表面等离子体光波导的比较发现,在730～800nm工作波长范围内,双正方形表面等离子体光波导的传输特性要优于后者。因此双正方形表面等离子体光波导有可能用于光子器件集成领域和传感器领域。
A double-square hollow-surface plasmon waveguide (SPW) was designed. Using the finite difference method in the frequency domain, the transmission characteristics of the fundamental modes supported by this waveguide are studied. The results show that the energy density along the longitudinal direction of the fundamental mode is mainly distributed in the center of the double square air core. By adjusting the side length, center distance and working wavelength of the two square air holes, the field distribution of the fundamental mode and the interaction between the field and the metallic silver can be adjusted so as to adjust the transmission of the effective refractive index, propagation distance and mode area characteristic. The comparison with the double circular hollow surface plasmon waveguide shows that the transmission characteristics of the double square plasmonic waveguide are superior to the latter in the working wavelength range of 730 ~ 800 nm. Therefore, double-square surface plasmon optical waveguide may be used in the field of photonic devices and sensors.