Toward Monoatomic-Layer Field Confinement Limit via Acoustic Graphene Plasmons

Abstract

Vertical plasmonic coupling in double-layer graphene leads to two hybridized plasmonic modes: optical and acoustic plasmons with symmetric and anti-symmetric charge distributions across the interlayer gap, respectively. However, in most experiments based on far-field excitation, only the optical plasmons are dominantly excited in the double-layer graphene systems. Here, we propose strategies to selectively and efficiently excite acoustic plasmons with a single or multiple nano-emitters. The analytical model developed here elucidates the role of the position and arrangement of the emitters on the symmetry of the resulting graphene plasmons. We present an optimal device structure to enable experimental observation of acoustic plasmons in double-layer graphene toward the ultimate level of plasmonic confinement defined by a monoatomic spacer, which is inaccesible with a graphene-on-a-mirror architecture.

References in corpus (12)

• The electronic properties of graphene
• Boron nitride substrates for high-quality graphene electronics
• Dielectric function, screening, and plasmons in 2D graphene
• Mid-Infrared Plasmonic Biosensing with Graphene
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Plasmons and screening in monolayer and multilayer black phosphorus
• Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons
• Far-field Excitation of Single Graphene Plasmon Cavities with Ultra-compressed Mode-volumes
• Real-space imaging of acoustic plasmons in large-area CVD graphene
• Gate-controlled mid-infrared light bending with aperiodic graphene nanoribbons array
• Quantum Surface-Response of Metals Revealed by Acoustic Graphene Plasmons
• Nonlinear Optical Observation of Coherent Acoustic Dirac Plasmons in Thin-Film Topological Insulators