Active spatial control of terahertz graphene plasmons by tailoring carrier density profile
arXiv:1911.08672
Abstract
Graphene offers a possibility for actively controlling plasmon confinement and propagation by tailoring its spatial conductivity pattern. However, implementation of this concept has been hampered because uncontrollable plasmon reflection is easily induced by inhomogeneous dielectric environment. In this work, we demonstrate full electrical control of plasmon reflection/transmission at electronic boundaries induced by a zinc-oxide-based dual gate, which is designed to minimize the dielectric modulation. Using Fourier-transform infrared spectroscopy, we show that the plasmon reflection can be varied continuously with the carrier density difference between the adjacent regions. By utilizing this functionality, we show the ability to control size, position, and frequency of plasmon cavities. Our approach can be applied to various types of plasmonic devices, paving the way for implementing a programmable plasmonic circuit.
arXiv commentto be published in Communications Materials
References in corpus (12)
- Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
- Manipulating infrared photons using plasmons in transparent graphene superlattices
- Probing the Ultimate Plasmon Confinement Limits with a Van der Waals heterostructure
- Plasmonic Luneburg and Eaton Lenses
- Magnetic field tuning of terahertz Dirac plasmons in graphene
- Electronic and plasmonic phenomena at graphene grain boundaries
- Gate-controlled Guiding of Electrons in Graphene
- Ballistic interferences in suspended graphene
- Hybrid Metal-Graphene Plasmons for Tunable Terahertz Technology
- Phase Resolved Surface Plasmon Interferometry of Graphene
- Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene
- Guiding of Electrons in a Few Mode Ballistic Graphene Channel