文章基本信息

标题：Improving nanoscale terahertz field localization by means of sharply tapered resonant nanoantennas
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作者：Vincenzo Aglieri ; Xin Jin ; Andrea Rovere 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2020
卷号：9
期号：3
页码：683-690
DOI：10.1515/nanoph-2019-0459
出版社：Walter de Gruyter GmbH
摘要：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.
关键词：nanoantennas ; terahertz science and technology ; enhanced light-matter interaction