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[] Functional graphene metamaterials by femtosecond laser reduction

Monash University
9 August 2017
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Abstract Abstract Pdf

Achieving broadband total light absorption of unpolarized light within a subwavelength
ultrathin film is critical for optoelectronic applications such as photovoltaics,
photodetectors, thermal emitters and optical modulators. Here we experimentally
demonstrate a low-cost and scalable multilayer graphene ultra-broadband total light
absorber of record-high 90% of unpolarized light absorption at near infrared
wavelengths with a bandwidth of more than 300 nm. The thin metamaterial consists of
alternating monolayer graphene and dielectric material prepared by a low-cost wet
chemical layer-by-layer method. A simple grating is fabricated using flexible
femtosecond laser writing that simultaneously removes the graphene in the ablated
regions and converts the remaining graphene oxide to graphene via photo-reduction.
Our results open a novel, flexible and viable approach to practical applications of
nanostructured photonic devices based on 2D materials, which require strong
absorption.

Cite this article as

Voelcker, N. Functional graphene metamaterials by femtosecond laser reduction. In Proceedings of the Optofluidics 2017, 25–28 July 2017; Singapore; doi:10.3390/optofluidics2017-04595

Author biographies

Nicolas Voelcker
nicolas.voelcker@monash.edu; Tel.: +61 3 99039230

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