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智科眼: 双语看懂新科研
首页 中国TOP论文 Nature Science JACS AngewChem PRL AdvMater Lancet Cell EnglMed JAMA
Transition metal dichalcogenide nanodisks as high-index dielectric Mie nanoresonators
过渡金属二硫化物纳米盘 as 高折射率电介质Mie纳米谐振器
Ruggero Verre; Denis G. Baranov; Battulga Munkhbat; Jorge Cuadra; Mikael Käll; Timur Shegai
  • Nat Nanotechnol vol: issue: (2019) [全文下载] 扫码分享
  • 影响因子: 37.5 点击(384) 收藏(0) 评分(0)
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  • 材料综合,纳米科学与技术
  • 最近已提出单层过渡金属二硫化物(TMDCs)作为用于先进光学和电子功能的激子平台1,2,3。然而,尽管进行了大量的研究工作,但尚未广泛认识到TMDC还具有高折射率4,5。这种特性开辟了利用它们构建基于亚波长几何模式的共振纳米天线的可能性6,7。在这里,我们展示了由剥离多层WS2制成的纳米盘,支持不同的Mie共振和anapole状态8,通过改变纳米盘尺寸和纵横比,可以在可见光和近红外范围内调谐波长。作为概念的证明,我们展示了一种新的光物质相互作用 - anapole-exciton极化子 - 我们在单个WS2纳米盘中实现了这种体系。我们认为TMDC材料各向异性和激子的存在丰富了传统的高折射率材料和/或等离子体激元的传统纳米光子学方法。
  • Monolayer transition metal dichalcogenides (TMDCs) have recently been proposed as an excitonic platform for advanced optical and electronic functionalities1,2,3. However, in spite of intense research efforts, it has not been widely appreciated that TMDCs also possess a high refractive index4,5. This characteristic opens up the possibility to utilize them to construct resonant nanoantennas based on subwavelength geometrical modes6,7. Here, we show that nanodisks, fabricated from exfoliated multilayer WS2, support distinct Mie resonances and anapole states8 that can be tuned in wavelength over the visible and near-infrared range by varying the nanodisk size and aspect ratio. As a proof of concept, we demonstrate a novel regime of light–matter interaction—anapole-exciton polaritons—which we realize within a single WS2 nanodisk. We argue that the TMDC material anisotropy and the presence of excitons enrich traditional nanophotonics approaches based on conventional high-index materials and/or plasmonics.
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