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

W. Y. Chong, W. H. Lim, Y. K. Yap, C. K. Lai, R. M. De La Rue, Harith Ahmad

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    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 opticalfrequency conductivity and consequently increased optical propagation loss. This behaviour in a GOcoated 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).

    Original languageEnglish
    Article number23813
    JournalScientific Reports
    Publication statusPublished - 1 Apr 2016

    ASJC Scopus subject areas

    • General


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