Xia Sheng-Xuan, Zhai Xiang, Huang Yu, Liu Jian-Qiang, Wang Ling-Ling, Wen Shuang-Chun
Opt Lett. 2017 Aug 1;42(15):3052-3055. doi: 10.1364/OL.42.003052.
We propose to achieve multi-band perfect plasmonic absorptions with peak absorptivity >99% via the excitation of standing-wave graphene surface plasmon polaritons using single-layer graphene-based rectangular gratings. For the case with continuous gratings, perfect absorptions are only allowed for even-order modes, while the absorptions are quite low for odd-order modes because the fields are out-of-phase. However, for gratings with bottom-open configuration, four-band perfect absorptions containing both the even- and odd-order modes can be realized, which are found to be highly sensitive to the incident angle. The simulated results agree very well with the theoretical analyses by considering the phase path of the plasmonic waves. This multi-band absorber is a promising candidate for future plasmonic devices.
我们提议通过使用基于单层石墨烯的矩形光栅激发驻波石墨烯表面等离子体激元极化激元，实现峰值吸收率>99%的多波段完美等离子体吸收。对于连续光栅的情况，仅偶数阶模式允许完美吸收，而奇数阶模式的吸收相当低，因为场是异相的。然而，对于底部开放配置的光栅，可以实现包含偶数阶和奇数阶模式的四波段完美吸收，发现其对入射角高度敏感。通过考虑等离子体波的相位路径，模拟结果与理论分析非常吻合。这种多波段吸收器是未来等离子体器件的一个有前途的候选者。
