|Title||Photoexcited Graphene Metasurfaces: Significantly Enhanced and Tunable Magnetic Resonances|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Fan, YC, Shen, NH, Zhang, FL, Zhao, Q, Wei, ZY, Zhang, P, Dong, JJ, Fu, QH, Li, HQ, Soukoulis, CM|
|Type of Article||Article|
|Keywords||anomalous, 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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