Quasi-Static Resonances in the Visible Spectrum from All-Dielectric Intermediate Band Semiconductor Nanocrystals,Nano Letters

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Quasi-Static Resonances in the Visible Spectrum from All-Dielectric Intermediate Band Semiconductor Nanocrystals
Nano Letters ( IF 9.6 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1021/acs.nanolett.7b03787
Roberto Gaspari , Giuseppe Della Valle , Sandeep Ghosh ₁ , Ilka Kriegel , Francesco Scotognella , Andrea Cavalli , Liberato Manna

Affiliation

The quest for materials with metal-like properties as alternatives to noble metals is an intense area of research that is set to lead to dramatic improvements in technologies based on plasmonics. Here, we present intermediate band (IB) semiconductor nanocrystals (NCs) as a class of all-dielectric nanomaterials providing quasi-static optical resonances. We show that IB NCs can display a negative permittivity in a broad range of visible wavelengths, enabling a metal-like optical response despite the absence of free carriers in the NC ground state. Using a combination of spectroscopy measurements and ab initio calculations, we hereby provide a theoretical model for both the linear and nonlinear optical properties of chalcopyrite CuFeS₂ NCs, as a case study of IB semiconductor nanomaterials. Our results rationalize the high performance of IB nanomaterials as photothermal agents and suggest the use of IB semiconductors as alternatives to noble metals for technologies based on plasmonic materials.

中文翻译：

全介电中间带半导体纳米晶体在可见光谱中的准静态共振

对具有类似金属特性的材料作为贵金属替代品的追求是一个激烈的研究领域，它将导致基于等离子技术的技术得到显着改善。在这里，我们介绍中间带（IB）半导体纳米晶体（NCs）作为提供准静态光学共振的一类全介电纳米材料。我们表明，IB NC可以在很宽的可见光波长范围内显示出负介电常数，尽管在NC基态下没有自由载流子，也可以实现类似金属的光学响应。结合光谱测量和从头算的计算，我们为黄铜矿CuFeS ₂的线性和非线性光学性质提供理论模型NC，作为IB半导体纳米材料的案例研究。我们的结果合理化了IB纳米材料作为光热剂的高性能，并建议使用IB半导体替代基于等离激元材料的技术中的贵金属。

更新日期：2017-11-19

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