1. Improving nanoscale terahertz field localization by means of sharply tapered resonant nanoantennas
- Author
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Roberto Macaluso, Salvatore Tuccio, Francesco De Angelis, Andrea Toma, Roberto Morandotti, Vincenzo Aglieri, Luca Razzari, Andrea Rovere, Xin Jin, Riccardo Piccoli, Diego Caraffini, Aglieri V., Jin X., Rovere A., Piccoli R., Caraffini D., Tuccio S., De Angelis F., Morandotti R., MacAluso R., Toma A., and Razzari L.
- Subjects
enhanced light-matter interaction ,Materials science ,Field (physics) ,business.industry ,Terahertz radiation ,Physics ,QC1-999 ,Physics::Optics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Settore ING-INF/01 - Elettronica ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,nanoantennas ,0103 physical sciences ,Optoelectronics ,nanoantenna ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Nanoscopic scale ,terahertz science and technology ,Biotechnology - 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.
- Published
- 2020