Graphene oxide-based waveguide polariser: From thin film to quasi-bulk

W. H. Lim, Y. K. Yap, W. Y. Chong, C. H. Pua, N. M. Huang, R. M. De La Rue, H. Ahmad

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    We have demonstrated a broadband waveguide polariser with high extinction ratio on a polymer optical waveguide coated with graphene oxide via the drop-casting method. The highest extinction ratio of nearly 40 dB is measured at 1590 nm, with a variation of 4.5 dB across a wavelength range from 1530 nm to 1630 nm, a ratio that is (to our knowledge) the highest reported for graphene-based waveguide polarisers to date. This result is achieved with a graphene oxide coating length along the propagation direction of only 1.3 mm and a bulk film thickness of 2.0 μm. The underlying principles of the strongly polarisation dependent propagation loss demonstrated have been studied and are attributed to the anisotropic complex dielectric function of graphene oxide bulk film.

    Original languageEnglish
    Pages (from-to)11090-11098
    Number of pages9
    JournalOptics Express
    Volume22
    Issue number9
    DOIs
    Publication statusPublished - 5 May 2014

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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