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采用有限时域差分(FDTD)法研究了内置金属/电介质同心圆柱结构的材料属性、半径及其相对高度对金属孔阵列强透射特性的影响。发现该结构与内置单一金属、单一电介质和电介质/金属三种不同的同心圆柱结构相比较,光的透射性能得到显著的增强;这种内置金属/电介质同心圆柱结构具有进一步增强表面等离激元与局域表面等离激元共振耦合作用。结果表明,金属、电介质的材料属性对强透射特性影响明显,当金属圆柱为Au、电介质圆柱折射率较小时,其透射性能较好;圆柱半径是影响透射率与共振峰位置的主要因素,半径越大,共振峰红移越明显,但其透射率先增大而后持续减小。同时,金属/电介质圆柱的相对高度也影响透射率大小,当金属圆柱高度为60nm时,其透射性能较好。
The influence of material properties, radius and relative height of the built-in metal / dielectric concentric cylindrical structure on the strong transmission characteristics of metal-hole arrays was studied by finite difference time-domain (FDTD) method. The structure was found to have significantly improved light transmission compared to three different concentric cylindrical structures containing a single metal, a single dielectric and a dielectric / metal; this built-in metal / dielectric concentric cylindrical structure has the potential to further enhance surface plasmon And local surface plasmon resonance coupling effect. The results show that the material properties of metals and dielectrics have a strong influence on the strong transmission properties. When the metal cylinder is Au and the refractive index of the dielectric cylinder is small, the transmission properties are better. The radius of the cylinder is the main factor affecting the transmissivity and formant position. The radius The larger the resonance peak redshifts the more obvious, but the transmittance increases first and then decreases continuously. At the same time, the relative height of the metal / dielectric cylinder also affects the transmissivity, which is better when the metal cylinder height is 60 nm.