Engineering optical properties of a graphene oxide metamaterial

demonstrate strong in-plane optical anisotropy (Δn≈0.3 at n≈1.5-1.8) ... Hartschuh, “Making graphene luminescent by oxygen plasma treatment,” .... In a dead-end geometry filled with a dilute solution or dispersion, .... Note that GO based materials ... of the GO sheet optical properties due to their assembly in microfluidic ...
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Engineering optical properties of a graphene oxide metamaterial assembled in microfluidic channels V. G. Kravets,1,* O. P. Marshall,1 R. R. Nair,1 B. Thackray,1 A. Zhukov,1 J. Leng,2 and A. N. Grigorenko1 2

1 University of Manchester, School of Physics and Astronomy, Manchester, UK CNRS, University of Bordeaux, RHODIA, LOF, UMR5258, F-33600, Pessac, France * [email protected]

Abstract: The dense packing of two dimensional flakes by van der Waals forces has enabled the creation of new metamaterials with desirable optical properties. Here we assemble graphene oxide sheets into a three dimensional metamaterial using a microfluidic technique and confirm their ordering via measurements of ellipsometric parameters, polarized optical microscopy, polarized transmission spectroscopy, infrared spectroscopy and scanning electron microscopy. We show that the produced metamaterials demonstrate strong in-plane optical anisotropy (Δn≈0.3 at n≈1.5-1.8) combined with low absorption (k