Optical signatures of nonlocal plasmons in graphene
Journal article, 2016

We theoretically investigate under which conditions nonlocal plasmon response in monolayer graphene can be detected. To this purpose, we study optical scattering off graphene plasmon resonances coupled using a subwavelength dielectric grating. We compute the graphene conductivity using the random phase approximation (RPA) obtaining a nonlocal conductivity, and we calculate the optical scattering of the graphene-grating structure. We then compare this with the scattering amplitudes obtained if graphene is modeled by the local RPA conductivity commonly used in the literature. We find that the graphene plasmon wavelength calculated from the local model may deviate up to 20% from the more accurate nonlocal model in the small-wavelength (large-q) regime. We also find substantial differences in the scattering amplitudes obtained from the two models. However, these differences in response are pronounced only for small grating periods and low temperatures compared to the Fermi temperature.

plasmons

graphene

Author

Tobias Wenger

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Giovanni Viola

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Mikael Fogelström

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Philippe Tassin

Chalmers, Physics, Condensed Matter Theory

Jari Kinaret

Chalmers, Physics, Condensed Matter Theory

Physical Review B: covering condensed matter and materials physics

2469-9969 (eISSN)

Vol. 94 20 205419-

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Atom and Molecular Physics and Optics

Nano Technology

DOI

10.1103/PhysRevB.94.205419

More information

Created

10/7/2017