In this talk I will discuss recent experiments aimed at using graphene to create resonant optical cavities that operate in the short-wavelength infrared, at wavelengths as short as 2.2um.  We use a new, bottom-up block copolymer lithography method to fabricate graphene nanoribbon arrays with characteristic widths varying from 30nm to as small as 12nm.   Subsequent infrared absorption measurements reveal that the narrowest nanoribbons support plasmonic resonances at higher frequencies from what is expected from the first order dielectric response in graphene.  We attribute this blue shift to strong non-local effects in graphene, which we model introducing a hydrodynamic term in the graphene dielectric function.  Our results show that at frequencies above the Mid-IR, non-local effects significantly perturb the behavior of plasmons in graphene.  These effects are beneficial for creating graphene-based optoelectronic devices that operate at higher frequencies, but they also act to weaken light-matter interactions in graphene.

Non-local effects in graphene plasmonic nanocavities operating below 3um

ACS Spring Meeting 2021

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