含有凹口的金属纳米环形共振器的本征模式分裂

提出了一种含有凹口金属纳米环形共振器结构,采用时域有限差分方法模拟了表面等离子体在这种结构中的传播特性.详细研究了凹口的长度、位置以及环的半径对透射性质的影响,发现当凹口的长度满足一定条件,并且处于某些特定位置的时候,与没有凹口的环形共振器相比,本征透射模式会发生分裂.随着环半径的增加,透射模式会向长波长方向移动,但不会对模式的分裂造成影响.

Splitting of transmission modes in a nanoscale metal ring resonator with a notch

A nanoscale metal ring resonator with a notch is proposed, in which the propagating characteristics of surface plasmons was studied with the help of finite-difference time-domain method. Influences of the length and position of the notch and the radius of the ring on the transmission properties of the ring resonator have been studied in detail. We found that, compared with the ring resonator without notch, the intrinsic mode of the ring resonator will split when the length and position of the notch satisfy some special conditions. In addition, the split modes will shift toward longer wavelengths as the radius of the ring increases, while the variation of the radius has no influence on the splitting behavior of the intrinsic modes.