Independently tunable perfect absorber based on the plasmonic properties in double-layer graphene. (December 2019)

• Record Type: Journal Article
• Authors: Wu, Di; Wang, Mei; Feng, He; Xu, Zixuan; Liu, Yunpeng; Xia, Feng; Zhang, Kun; Kong, Weijin; Dong, Lifeng; Yun, Maojin
• Is Part Of: Carbon. Volume 155(2019)
• Page Start: 618
• Page End: 623
• Publication Date: 2019-12
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.09.024
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Graphene can be utilized in designing tunable photonic devices due to its unique properties such as high optical transparency and tunable conductivity. In this paper, a tunable triple-band perfect absorber is designed and numerically demonstrated, which is composed of a stacked graphene nanodisk, L-shape graphene layer and a gold ground plane spaced by insulator layers. The results show that there are three higher than 99% absorption peaks in the infrared range with a wide incident angle range up to 50°, and the absorber is insensitive for TE and TM polarized incident light. Moreover, the perfect absorption peak wavelength can be tuned by changing Fermi levels or geometric parameters of graphene layers. The findings above indicate that the designed perfect absorber can be used in the field of photodetectors, thermal emitters and photovoltaics. Graphical abstract: Image 105556 As shown in the Figure (a) the tunable triple-band perfect absorber which is composed of a stacked graphene nanodisk, L-shape graphene layer and a gold ground plane spaced by insulator layers and the absorption can be significantly enhanced due to the SPPs in graphene layers. Absorption spectra for the structure shown in Figure. (b) (black solid line), the structure without an array of L-shaped graphene (yellow dashed line), and the structure without an array of graphene nanodisks (red dashed line). Figure (c) shows absorption spectra for TE wave with different incident angles θ.