Fan Yang, Wang Bing, Wang Kai, Long Hua, Lu Peixiang
Opt Lett. 2016 Jul 1;41(13):2978-81. doi: 10.1364/OL.41.002978.
We investigate the plasmonic Zener tunneling (ZT) in arrays of weakly coupled graphene sheet waveguides. By alternatively arranging the graphene waveguides with two different chemical potentials, the single surface plasmon polariton (SPP) band splits into two minibands, and tunneling between them occurs at the edge of the Brillouin zone. With a linear gradient of the propagation constant introduced by appropriately tuning the chemical potential distribution over the graphene sheet, the SPPs exhibit a sequence of Bloch oscillations and ZT transitions in the arrays. The simulated tunneling rate coincides with the theoretical analysis based on the coupled-mode theory, which can be tuned by varying the chemical potential difference between adjacent graphene.
我们研究了弱耦合石墨烯片波导阵列中的等离子体齐纳隧穿（ZT）。通过交替排列具有两种不同化学势的石墨烯波导，单表面等离激元极化激元（SPP）能带分裂为两个微带，并且它们之间的隧穿发生在布里渊区边缘。通过适当调整石墨烯片上的化学势分布引入传播常数的线性梯度，SPP在阵列中表现出一系列布洛赫振荡和ZT跃迁。模拟的隧穿速率与基于耦合模理论的理论分析一致，该理论分析可以通过改变相邻石墨烯之间的化学势差来调整。
