Active control of all-fibre graphene devices with electrical gating
- Active control of all-fibre graphene devices with electrical gating
- 이은정; 최선영; 정환성; 박남훈; 임웅빈; 김미혜; 박재구; 손수연; 배수강; 김상진; 이관일; 안영환; 안광준; 홍병희; 박지용; Fabian Rotermund; 염동일
- 그래핀; 광섬유
- Issue Date
- Nature Communications
- VOL 6, 1-6
- Active manipulation of light in optical fibres has been extensively studied with great interest
because of its compatibility with diverse fibre-optic systems. While graphene exhibits a strong electro-optic effect originating from its gapless Dirac-fermionic band structure, electric control of all-fibre graphene devices remains still highly challenging. Here we report electrically manipulable in-line graphene devices by integrating graphene-based field effect transistors on a side-polished fibre. Ion liquid used in the present work critically acts both as an efficient gating medium with wide electrochemical windows and transparent over-cladding facilitating light–matter interaction. Combined study of unique features in gate-variable electrical transport and optical transition at monolayer and randomly stacked multilayer graphene reveals that the device exhibits significant optical transmission change (490%) with high efficiency-loss figure of merit. This subsequently modifies nonlinear saturable absorption characteristics of the device, enabling electrically tunable fibre laser at various operational regimes. The proposed device will open promising way for actively controlled optoelectronic and nonlinear photonic devices in all-fibre platform with greatly enhanced graphene–light interaction.
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