Cupric Oxide Mie Resonators
Cupric Oxide Mie Resonators
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DOI：
10.1021/acs.jpcc.2c04646
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
S. Ramakrishnan;Nishant Khatri;Ravi Teja Addanki Tirumala;Farshid Mohammadparast;Krishnageetha Karuppasamy;A. Kalkan;M. Andiappan
中科院分区：
文献类型：
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作者：
S. Ramakrishnan;Nishant Khatri;Ravi Teja Addanki Tirumala;Farshid Mohammadparast;Krishnageetha Karuppasamy;A. Kalkan;M. Andiappan
在过去的二十年里，等离子体米氏谐振器在亚波长尺度和光的操纵方面取得了许多突破，以及在更大的尺度上，通过构建超材料/表面，如人造原子。这些特征的核心是增强的场浓度和消光在Mie共振截面。这些独特的方面也表现在中高折射率介电Mie谐振器。介电Mie谐振器提供了进一步的独特属性，如磁共振和低损耗。在这里，我们报道了具有中等折射率的亚微米氧化铜（CuO）粒子，它可以表现出强的电和磁Mie共振，其消光/散射截面与等离子体谐振器一样大。通过粒子合成技术的发展，实现形状和尺寸控制，光谱学和有限差分时域模拟，我们表明Mie共振波长是尺寸和形状相关的。这种光谱在可见光到近红外区域的可调性允许在更大范围的太阳光谱中进行能量收集和光操作。CuO粒子的强电场和磁性微波共振介导的纳米天线特性可以在超材料/表面、光催化和光伏等应用中得到潜在的利用。
In the past two decades, plasmonic Mie resonators enabled numerous breakthroughs in the manipulation of light at the subwavelength scale as well as at larger scales through the construction of metamaterials/surfaces from them, as artificial atoms. Central to these features are enhanced field concentrations and extinction cross sections at Mie resonances. These unique aspects are also exhibited by moderate-to-high refractive index dielectric Mie resonators. Dielectric Mie resonators offer further unique attributes, such as magnetic resonances and low losses. Here, we report on submicron cupric oxide (CuO) particles with a medium refractive index that can exhibit strong electric and magnetic Mie resonances with extinction/scattering cross sections as large as those of plasmonic resonators. Through the development of particle synthesis techniques enabling shape and size control, optical spectroscopy, and finite-difference-time-domain simulations, we show the Mie resonance wavelengths are size- and shape-dependent. This spectral tunability in the visible-to-near-infrared regions allows for energy harvesting and light manipulation in a wider range of the solar spectrum. The strong electric and magnetic Mie-resonance-mediated nanoantenna attribute of CuO particles can be potentially exploited in applications, such as metamaterials/surfaces, photocatalysis, and photovoltaics.