A dynamic grating with tunable duty cycle and height
A dynamic grating with tunable duty cycle and height
复制标题
占空比和高度可调的动态光栅
DOI：
10.1016/j.optcom.2022.128762
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发表时间：
2022
影响因子：
2.4
通讯作者：
Zhongjie Zhu
中科院分区：
文献类型：
--
作者：
Xuefang Hu;Weiyi Jing;Changgui Lu;Xiangyue Zhao;Yongqiang Bai;Yinwei Gu;Mengjia Lu;Zhongjie Zhu
光栅以其独特的色散特性在各种光学系统中起着举足轻重的作用。然而，传统的光栅一旦制造就具有固定的功能。本文提出了一种基于叉指电极-介质-石墨烯混合结构的可调谐光栅。当在电极上施加电压时，石墨烯上的载流子呈现周期性分布，这使得石墨烯表现出类似于光栅的行为。在此，光栅的占空比和高度可以由电压动态地控制。数值计算结果表明，在波长为7。当利用所设计的结构激发表面等离子体激元（SPP）时，由于SPP的激发效率随光栅参数的变化而变化，因此在4 μ m处获得了较好的衍射效果。这种新型光栅在未来的调制器、光电探测器和传感器等方面具有潜在的应用前景。·我们提出了基于混合叉指电极-电介质-石墨烯结构的具有可调占空比和高度的动态光栅。当电极上施加电压时，石墨烯表面的载流子密度呈现出周期性的空间分布，并且随着电压的变化，石墨烯呈现出不同的光学特性，类似于可调谐光栅。·模拟结果表明，石墨烯中的吸收在波长7 . 4 μ m时，由于表面等离子体激元的激发效率随占空比而变化，因此该结构可以有效地激发表面等离子体激元。·不同电压下的电场强度分布变化明显，起到良好的开关作用。
Grating plays a pivotal role in various optical systems owing to its unique dispersion properties. However, the traditional grating has fixed functionalities once fabricated. In this paper, a tunable grating based on a hybrid interdigitated electrodes-dielectric-graphene structure is proposed. The carrier on the graphene exhibits a periodic distribution when the voltage is applied on the electrode, which makes the graphene behave like a grating. Herein, the duty cycle and height of the grating can be dynamically controlled by the voltage. The numerical result shows that the absorption in graphene changes by 10.2% at the wavelength of 7 . 4 μ m when the designed structure is utilized to excite the surface plasmon polaritons (SPPs) since the excitation efficiency of SPPs varies with the parameters of grating. This new type of grating will have a potential application in future modulators, photodetectors and sensors. • We proposed dynamic grating with tunable duty cycle and height based on a hybrid interdigitated electrodes-dielectric-graphene structure. The carrier density on the graphene surface exhibit a periodic spatial distribution when the voltage is applied on the electrode, and the graphene presents different optical properties like a tunable grating as the voltage changes. • The simulation results showed that the absorption in graphene changes by 10.2% at the wavelength of 7 . 4 μ m when the proposed structure is utilized to excite the surface plasmon polaritons (SPPs) since the excitation efficiency of SPPs varies with the duty cycle. • The distribution of electric intensity at different voltage varied obvious, and performed a good function of switch.