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

Vincenzo Aglieri, Roberto Macaluso, Riccardo Piccoli, Salvatore Tuccio, Andrea Rovere, Xin Jin, Vincenzo Aglieri, Francesco De Angelis, Luca Razzari, Diego Caraffini, Xin Jin, Diego Caraffini, Diego Caraffini, Roberto Morandotti, Luca Razzari, Andrea Toma

Risultato della ricerca: Articlepeer review

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.
Lingua originaleEnglish
pagine (da-a)683-690
Numero di pagine8
RivistaNanophotonics
Volume9
Stato di pubblicazionePublished - 2020

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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