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Active Control of Asymmetric Fano Resonances with Graphene–Silicon‐Integrated Terahertz Metamaterials
Author(s) -
Li Quan,
Gupta Manoj,
Zhang Xueqian,
Wang Shuang,
Chen Tai,
Singh Ranjan,
Han Jiaguang,
Zhang Weili
Publication year - 2020
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201900840
Subject(s) - fano resonance , terahertz radiation , metamaterial , graphene , optoelectronics , materials science , lasing threshold , silicon , biasing , ultrashort pulse , optics , plasmon , laser , nanotechnology , voltage , physics , wavelength , quantum mechanics
Planar metamaterials are extensively studied in recent years due to their potential applications in design of flat optical components, ultrasensitive sensors, lasing spasers, and nonlinear devices. Recent studies have reported dynamic control of photoactive material–based metamaterials through optical excitation. However, most of the previous demonstrations rely on single stimulus control and typically require large fluence and ultrafast pulses of light. Here, graphene is integrated with Fano resonant metasurface on silicon substrate that provides active modulation of terahertz waves with low‐power, continuous wave (CW) optical (λ = 532 nm) excitation. More importantly, the hybrid graphene–silicon system provides “dual control” through a combination of applied electrical bias voltage and photodoping of silicon by CW illumination which alters the conductivity of the graphene resulting in an active modulation of the metamaterial resonance. Large real‐time tunability with dual control characteristics of resonant metasurfaces can be a promising route for designing active and functional terahertz metadevices.