基于Au-SiO_(2)-Au结构的三峰近红外吸收器

Near infrared three-band absorber based on Au-SiO_(2)-Au

设计了一种具有六边形图案的超构红外吸收器,利用时域有限差分(FDTD)方法研究了该吸收器的吸收特性。研究表明,该结构在红外波段有3个吸收峰,吸收峰的峰位可通过改变结构参数进行调控。增加石墨烯层后,该吸收器的共振吸收峰可通过改变石墨烯的费米能级调节。此吸收器在光电探测、光通信、光滤波等领域具有潜在应用。

An infrared absorber with Au-SiO_(2)-Au structure was designed.The absorption properties of the absorber were investigated using finite difference time domain(FDTD).It was found that in infrared region there are three absorption peaks which can be tuned by changing the structure parameters.After adding graphene film on the structure,the three resonant absorption peaks can be adjusted by tuning the Fermi level of the graphene.The absorber can be applied in photo-electronic detecting,optical communication and optical filter.