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分析了在1 550 nm波长下超薄金属膜(金膜厚t=10 nm)V-型槽等离子波导间长程沟道等离激元导模的定向耦合。通过计算不同波导间距下的模式分布,得出了定向耦合器中奇、偶模有效折射率实部和传播长度随波导间距的变化情况,并进一步计算了相邻波导间的耦合长度、最大串扰与波导间距的关系曲线。计算结果表明:在波导间距较小时,耦合长度小于各模式的传播长度,随着波导间距的增加,耦合长度随之增加,最大串扰随之减小。对超薄金属膜V-型槽等离子波导的定向耦研究在集成光路的实际应用中具有重要的价值。
The directional coupling of the long-range channel plasmon polariton between the V-groove plasma waveguide and the ultra-thin metal film (gold film thickness t = 10 nm) at 1 550 nm was analyzed. By calculating the mode distribution under different waveguide spacings, the real part and propagation length of the effective refractive index of the odd and even modes in the directional coupler are obtained. The coupling length, the maximum crosstalk And waveguide spacing curve. The calculation results show that the coupling length is smaller than the propagation length of each mode when the waveguide spacing is small. As the waveguide spacing increases, the coupling length increases and the maximum crosstalk decreases. The research on the directional coupling of ultra-thin metal film V-groove plasma waveguide is of great value in the practical application of integrated optical path.