Lee, Eun Jung Choi, Sun Young Jeong, Hwanseong Park, Nam Hun Yim, Woongbin Kim, Mi Hye Park, Jae-Ku Son, Suyeon Bae, Sukang Kim, Sang Jin Lee, Kwanil Ahn, Yeong Hwan Ahn, Kwang Jun Hong, Byung Hee Park, Ji-Yong Rotermund, Fabian Yeom, Dong-Il 2024-01-20T07:30:54Z 2024-01-20T07:30:54Z 2021-09-05 2015-04 2041-1723 https://pubs.kist.re.kr/handle/201004/125591 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. English NATURE PUBLISHING GROUP SATURABLE ABSORBER OPTICAL MODULATOR LAYER GRAPHENE IONIC LIQUIDS TRANSISTORS PHOTODETECTOR ELECTRODES PHOTONICS NANOTUBE LASERS Active control of all-fibre graphene devices with electrical gating Article 10.1038/ncomms7851 1 NATURE COMMUNICATIONS, v.6 NATURE COMMUNICATIONS 6 scie scopus 000353703400018 2-s2.0-84928400073 Multidisciplinary Sciences Science & Technology - Other Topics Article SATURABLE ABSORBER OPTICAL MODULATOR LAYER GRAPHENE IONIC LIQUIDS TRANSISTORS PHOTODETECTOR ELECTRODES PHOTONICS NANOTUBE LASERS 그래핀 광섬유