Das Susbhan, Salandrino Alessandro, Wu Judy Z, Hui Rongqing
Opt Lett. 2015 Apr 1;40(7):1516-9. doi: 10.1364/OL.40.001516.
We propose a novel scheme for an electro-optic modulator based on plasmonically enhanced graphene. As opposed to previously reported designs where the switchable absorption of graphene itself was employed for modulation, here a graphene monolayer is used to actively tune the plasmonic resonance condition through the modification of interaction between optical field and an indium tin oxide (ITO) plasmonic structure. Strong plasmonic resonance in the near infrared wavelength region can be supported by accurate design of ITO structures, and tuning the graphene chemical potential through electrical gating switches on and off the ITO plasmonic resonance. This provides much increased electro-absorption efficiency as compared to systems relying only on the tunable absorption of the graphene.
我们提出了一种基于等离子体增强石墨烯的电光调制器新方案。与先前报道的利用石墨烯自身可切换吸收进行调制的设计不同，这里使用单层石墨烯通过改变光场与铟锡氧化物（ITO）等离子体结构之间的相互作用来主动调节等离子体共振条件。通过对ITO结构的精确设计，可以在近红外波长区域支持强烈的等离子体共振，并且通过电门控调节石墨烯化学势来开启和关闭ITO等离子体共振。与仅依赖石墨烯可调吸收的系统相比，这大大提高了电吸收效率。
