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Lookup NU author(s): Professor Noel Healy
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Graphene is a highly versatile two-dimensional material platform that offers exceptional optical and electrical properties. Of these, its dynamic conductivity and low effective carrier mass are of particular interest for optoelectronic applications as they underpin the material’s broadband nonlinear optical absorption and ultra-fast carrier mobility, respectively. In this paper, we utilize these phenomena to demonstrate a high-speed, in-fibre optical modulator developed on a side-polished optical fibre platform. An especially low insertion loss (<1 dB) was achieved by polishing the fibre to a near atomically smooth surface (<1 nm RMS), which minimized scattering and ensured excellent contact between the graphene film and the fibre. In order to enhance the light-matter interaction, the graphene film is coated with a high index polyvinyl butyral layer, which has the added advantage of acting as a barrier to the surrounding environment. Using this innovative approach, we have fabricated a robust and stable all-fibre device with an extinction ratio as high as 9 dB and operation bandwidth of 0.5 THz. These results represent a key step towards the integration of low-dimensional materials within standard telecoms networks.
Author(s): Zhang H, Healy N, Shen L, Huang CC, Hewak DW, Peacock AC
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Online publication date: 22/03/2016
Acceptance date: 22/03/2016
Date deposited: 26/04/2016
ISSN (electronic): 2045-2322
Publisher: Nature Publishing Group
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