Electric Directional Steering of Cathodoluminescence from Graphene-Based Hybrid Nanostructures
| Autor: | Andrea Marini, Claudio Conti, Alessandro Ciattoni |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Nanophotonics General Physics and Astronomy Physics::Optics FOS: Physical sciences Cathodoluminescence 02 engineering and technology Electron 01 natural sciences law.invention plasmon law 0103 physical sciences nanostructures Polariton 010306 general physics Quantum Plasmon Graphene business.industry cathodoluminescence 021001 nanoscience & nanotechnology Dipole Optoelectronics nanoantenna 0210 nano-technology business Physics - Optics Optics (physics.optics) |
| Zdroj: | Physical Review Applied 15 (2021): 054016-1–054016-17. doi:10.1103/PhysRevApplied.15.054016 info:cnr-pdr/source/autori:Ciattoni A.; Conti C.; Marini A./titolo:Electric Directional Steering of Cathodoluminescence from Graphene-Based Hybrid Nanostructures/doi:10.1103%2FPhysRevApplied.15.054016/rivista:Physical Review Applied/anno:2021/pagina_da:054016-1/pagina_a:054016-17/intervallo_pagine:054016-1–054016-17/volume:15 |
| Popis: | Controlling directional emission of nanophotonic radiation sources is fundamental to tailor radiation-matter interaction and to conceive highly efficient nanophotonic devices for on-chip wireless communication and information processing. Nanoantennas coupled to quantum emitters have proven to be very efficient radiation routers, while electrical control of unidirectional emission has been achieved through inelastic tunneling of electrons. Here we prove that the radiation emitted from the interaction of a high-energy electron beam with a graphene-nanoparticle composite has beaming directions which can be made to continuously span the full circle even through small variations of the graphene Fermi energy. Emission directionality stems from the interference between the double cone shaped electron transition radiation and the nanoparticle dipolar diffraction radiation. Tunability is enabled since the interference is ruled by the nanoparticle dipole moment whose amplitude and phase are driven by the hybrid plasmonic resonances of the composite and the absolute phase of the graphene plasmonic polariton launched by the electron, respectively. The flexibility of our method provides a way to exploit graphene plasmon physics to conceive improved nanosources with ultrafast reconfigurable radiation patterns. |
| Databáze: | OpenAIRE |
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