Active control of all-fibre graphene devices with electrical gating

Eun Jung Lee, Sun Young Choi, Hwanseong Jeong, Nam Hun Park, Woongbin Yim, Mi Hye Kim, Jae-Ku Park, Suyeon Son, Sukang Bae, Sang Jin Kim, Kwanil Lee, Yeong Hwan Ahn, Kwang Jun Ahn, Byung Hee Hong, Ji-Yong Park, Fabian Rotermund () and Dong-Il Yeom ()
Additional contact information
Eun Jung Lee: Ajou University
Sun Young Choi: Ajou University
Hwanseong Jeong: Ajou University
Nam Hun Park: Ajou University
Woongbin Yim: Ajou University
Mi Hye Kim: Ajou University
Jae-Ku Park: Ajou University
Suyeon Son: Soft Innovative Materials Research Center, Korea Institute of Science and Technology (KIST)
Sukang Bae: Soft Innovative Materials Research Center, Korea Institute of Science and Technology (KIST)
Sang Jin Kim: Seoul National University
Kwanil Lee: Nano Photonics Research Center, KIST
Yeong Hwan Ahn: Ajou University
Kwang Jun Ahn: Ajou University
Byung Hee Hong: Seoul National University
Ji-Yong Park: Ajou University
Fabian Rotermund: Ajou University
Dong-Il Yeom: Ajou University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract 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 (>90%) 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.

Date: 2015
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DOI: 10.1038/ncomms7851

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