基于石墨烯-hBN薄膜多波段光吸收特性调控

Regulation of Multiwavelength Optical Absorption Property Based on Graphene-hBN Thin Films

在红外波段,石墨烯和六方氮化硼(Hexagonal Boron Nitride,hBN)作为能够激发等离子体激元(Plasmons Polariton)和声子极化激元(Phonon Polariton)很好的二维(Two-Dimensional,2D)材料,在传感、波导和探测领域等将有着极大的应用价值。本文设计一种石墨烯-hBN/银光栅混合异质结构,利用光栅沟槽内激发的磁极化(Magnetic Polariton,MP)效应诱导等离子体-声子极化激元增强和调控混合异质结构的吸收率.混合异质结构的吸收率和电磁场特性基于有限元的计算方法,并研究了结构参数变化对吸收特性的影响。所提出的混合结构可为光学探测等领域提供潜在的参考。

In the infrared band, graphene and hexagonal boron nitride （hBN）, as excellent two- dimensional （2D） materials capable of exciting Plasmons Polariton and Phonon Polariton, have great application value in the fields of sensing, waveguide and detection. In this paper, a graphene- hBN/silver grating hybrid heterostrueture is designed to enhance and control the absorptivity of graphene-hBN by utilizing plasma-phonon polaritons, which are induced by the magnetic Polariton （MP） effect excited in the grating groove. The absorption and electromagnetic properties of the hybrid heterostructure are calculated by the finite element method. The influence of structural parameters on the absorption characteristic is also studied. The hybrid structure proposed in this paper could provide a potential reference for optical detection and other fields.