外文题目: Tunable ultranarrow spectrum selective absorption in a graphene monolayer at terahertz frequency
作者: Wu, Jun
刊名: J. Phys. D-Appl. Phys.
年: 2016 卷: 49 期: 21 文章编号：215108
英文关键词:
diffraction and gratings; graphene; spectrum selective absorption
PLASMONICS; PHOTONICS; ABSORBER; GRATINGS; SURFACE; DEVICES; LIGHT
英文摘要:
Complete absorption in a graphene monolayer at terahertz frequency through the critical coupling effect is investigated. It is achieved by sandwiching the graphene monolayer between a dielectric grating and a Bragg grating. The designed graphene absorber exhibits near-unity absorption at resonance but with an ultranarrow spectrum and antenna-like response, which is attributed to the combined effects of guided mode resonance with dielectric grating and the photonic band gap with Bragg grating. In addition to numerical simulation, the electric field distributions are also illustrated to provide a physical understanding of the perfect absorption effect. Furthermore, the absorption performance can be tuned by only changing the Fermi level of graphene, which is beneficial for real application. It is believed that this study may be useful for designing next-generation graphene-based optoelectronic devices.


文献类型: 期刊论文
正文语种: English
收录类别: SCIEI
DOI: 10.1088/0022-3727/49/21/215108


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