Active control of all-fibre graphene devices with electrical gating

Title
Active control of all-fibre graphene devices with electrical gating
Authors
이은정최선영정환성박남훈임웅빈김미혜박재구손수연배수강김상진이관일안영환안광준홍병희박지용Fabian Rotermund염동일
Keywords
그래핀; 광섬유
Issue Date
2015-04
Publisher
Nature Communications
Citation
VOL 6, 1-6
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 (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.
URI
http://pubs.kist.re.kr/handle/201004/49613
ISSN
20411723
Appears in Collections:
KIST Publication > Article
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