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Photoexcited Graphene Metasurfaces: Significantly Enhanced and Tunable Magnetic Resonances

TitlePhotoexcited Graphene Metasurfaces: Significantly Enhanced and Tunable Magnetic Resonances
Publication TypeJournal Article
Year of Publication2018
AuthorsFan, YC, Shen, NH, Zhang, FL, Zhao, Q, Wei, ZY, Zhang, P, Dong, JJ, Fu, QH, Li, HQ, Soukoulis, CM
JournalAcs Photonics
Date Published04
Type of ArticleArticle
ISBN Number2330-4022
Accession NumberWOS:000430642500058
Keywordsanomalous, coherent perfect absorption, frequencies, gain, graphene plasmonics, light, loss compensation, magnetic resonance, Materials Science, meta-surface, monolayer graphene, negative-index metamaterials, optics, physics, plasmonics, refraction, resonators, split-ring, surface conductivity, Technology - Other Topics, terahertz metamaterials

Artificially constructed metamaterials or meta surfaces with tailored resonant elements provide a revolutionary platform for controlling light at the subwavelength scale. Switchable or frequency-agile meta-devices are highly desirable in achieving more flexible functionalities and have been explored extensively by incorporating various materials, which respond to external stimuli. Graphene, a two-dimensional material showing extraordinary physical properties, has been found very promising for tunable meta-devices. However, the high intrinsic loss of graphene severely obstructs us from achieving high-quality resonance in various graphene metamaterials and metasurfaces, and the loss compensation can be considered as a straightforward strategy to take further advantages of enhanced light graphene interactions. Here, we demonstrate that the photoexcited graphene, in which the quasi-Fermi energy of graphene changes corresponding to optical pumping, can boost the originally extremely weak magnetic resonance in a graphene split-ring metasurface, showing remarkable modulations in the transmission. Our work pioneers the possibilities of optically pumped graphene metasurfaces for significant enhancement of resonances and feasible modulations.

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