Excitation of localized graphene plasmons by aperiodic self-assembled arrays of metallic antennas
| Autor: | Dmitry Svintsov, S. N. Zhukov, Elena S. Zhukova, Domaratskiy I, B Khlebtsov, A. V. Miakonkikh, Vladimir Kaydashev, D. A. Mylnikov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Terahertz radiation Physics::Optics Bioengineering 02 engineering and technology Grating 010402 general chemistry 01 natural sciences law.invention law Physics::Atomic and Molecular Clusters General Materials Science Electrical and Electronic Engineering Plasmon business.industry Scattering Graphene Mechanical Engineering Fano resonance General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Mechanics of Materials Optoelectronics Nanorod 0210 nano-technology business Excitation |
| Zdroj: | Nanotechnology. 32(3) |
| ISSN: | 1361-6528 |
| Popis: | Infrared (IR) and terahertz plasmons in two-dimensional (2D) materials are commonly excited by metallic or dielectric grating couplers with deep-submicron features fabricated by e-beam lithography. Mass reproduction of such gratings at macroscopic scales is a labor-consuming and expensive technology. Here, we show that localized plasmons in graphene can be generated on macroscopic scales with couplers based on randomly oriented particle-like nanorods (NRs) in close proximity to graphene layer. We monitor the excitation of graphene plasmons indirectly by tracking the changes in reflection/absorption spectra of methylene blue (MB) or polymethyl methacrylate(PMMA) molecules deposited on the structure. Hybridization of spectrally broad graphene plasmon and narrow molecular oscillators results in enhanced oscillator strengths and Fano scattering related lines asymmetry in reflection spectra. |
| Databáze: | OpenAIRE |
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