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RESEARCH PRODUCT

Improving nanoscale terahertz field localization by means of sharply tapered resonant nanoantennas

Roberto MacalusoSalvatore TuccioFrancesco De AngelisAndrea TomaRoberto MorandottiRoberto MorandottiVincenzo AglieriVincenzo AglieriVincenzo AglieriLuca RazzariAndrea RovereXin JinRiccardo PiccoliDiego Caraffini

subject

enhanced light-matter interactionMaterials scienceField (physics)business.industryTerahertz radiationPhysicsQC1-999Physics::Optics02 engineering and technology021001 nanoscience & nanotechnologySettore ING-INF/01 - Elettronica01 natural sciencesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materials010309 opticsnanoantennas0103 physical sciencesOptoelectronicsnanoantennaElectrical and Electronic Engineering0210 nano-technologybusinessNanoscopic scaleterahertz science and technologyBiotechnology

description

Abstract Terahertz resonant nanoantennas have recently become a key tool to investigate otherwise inaccessible interactions of such long-wavelength radiation with nano-matter. Because of their high-aspect-ratio rod-shaped geometry, resonant nanoantennas suffer from severe loss, which ultimately limits their field localization performance. Here we show, via a quasi-analytical model, numerical simulations, and experimental evidence, that a proper tapering of such nanostructures relaxes their overall loss, leading to an augmented local field enhancement and a significantly reduced resonator mode volume. Our findings, which can also be extended to more complex geometries and higher frequencies, have profound implications for enhanced sensing and spectroscopy of nano-objects, as well as for designing more effective platforms for nanoscale long-wavelength cavity quantum electrodynamics.

yearjournalcountryeditionlanguage
2020-01-09Nanophotonics
https://doi.org/10.1515/nanoph-2019-0459