Photo-induced reduction of graphene oxide coating on optical waveguide and consequent optical intermodulation

Chong, W.Y., Lim, W.H., Yap, Y.K., Lai, C.K., De La Rue, R.M. and Ahmad, H. (2016) Photo-induced reduction of graphene oxide coating on optical waveguide and consequent optical intermodulation. Scientific Reports, 6, p. 23813. (doi:10.1038/srep23813) (PMID:27034015) (PMCID:PMC4817118)

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Abstract

Increased absorption of transverse-magnetic (TM) - polarised light by a graphene-oxide (GO) coated polymer waveguide has been observed in the presence of transverse-electric (TE) - polarised light. The GO-coated waveguide exhibits very strong photo-absorption of TE-polarised light - and acts as a TM-pass waveguide polariser. The absorbed TE-polarised light causes a significant temperature increase in the GO film and induces thermal reduction of the GO, resulting in an increase in optical-frequency conductivity and consequently increased optical propagation loss. This behaviour in a GO-coated waveguide gives the action of an inverted optical switch/modulator. By varying the incident TE-polarised light power, a maximum modulation efficiency of 72% was measured, with application of an incident optical power level of 57 mW. The GO-coated waveguide was able to respond clearly to modulated TE-polarised light with a pulse duration of as little as 100 μs. In addition, no wavelength dependence was observed in the response of either the modulation (TE-polarised light) or the signal (TM-polarised light).

Item Type:Articles
Additional Information:This work was supported in part by the University of Malaya High Impact Research Grant (UM.C/HIR/MOHE/SC/29/01), MOE FRGS Grant (FRGS/1/2014/SG06/UM/02/2) and LRGS Grant (LRGS(2015)NGOD/UM.KPT).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:De La Rue, Professor Richard
Authors: Chong, W.Y., Lim, W.H., Yap, Y.K., Lai, C.K., De La Rue, R.M., and Ahmad, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Scientific Reports
Publisher:Nature Publishing Group
ISSN:2045-2322
ISSN (Online):2045-2322
Published Online:01 April 2016

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