A hybrid graphene-gold nanomesh, realized through Au deposition on a patterned graphene nanomesh with a focused ion beam, is introduced and illustrated for enhanced light absorption in the visible spectrum. Numerical studies reveal that the hybrid nanomesh with dual resonances in the visible spectrum exhibit ~50% light absorption and enhancement factor as high as ~1 × 108. The simulations also show that the enhanced optical absorption is associated with the excitation of surface Plasmons. This is confirmed through the localization of electric fields at the resonant wavelengths. Such a hybrid graphene-gold nanomesh exhibiting enhanced light-matter interactions paves the way toward plasmonics, surface-enhanced Raman scattering applications, etc.
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The work was financially supported by the IITB-Monash Research Academy, IRCC (Seed grant, Spons/ME/I14079-1/2014), the Indian Institute of Technology Bombay, and the Monash Engineering Seed Fund. Vivek Garg is sponsored by the Tata Consultancy Services (TCS) research scholarship. The facilities at Melbourne Centre for Nanofabrication (MCN), Monash Centre for Electron Microscopy (MCEM), Victorian Node of the Australian National Fabrication Facility (ANFF), and Monash Campus Cluster (MCC) are acknowledged. The authors thank Dr. Yu Chen, MCEM staff, for TEM characterization.
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Garg, V., Kamaliya, B., Mote, R.G. et al. Enhanced light-matter interactions in size tunable graphene-gold nanomesh. MRS Communications 10, 135–140 (2020). https://doi.org/10.1557/mrc.2019.162