Substrate‐Modulated Electromagnetic Resonances in Colloidal Cu2O Nanospheres,Particle & Particle Systems Characterization

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Substrate‐Modulated Electromagnetic Resonances in Colloidal Cu2O Nanospheres
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-05-05 , DOI: 10.1002/ppsc.202000106
Nannan Li ₁ , Hao Wang ₂ , Yunhe Lai ₁ , Huanjun Chen ₂ , Jianfang Wang ₁

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Dielectric nanoparticles are expected to complement or even replace plasmonic nanoparticles in many optical and optoelectronic applications, because they exhibit small absorption losses and support strong electric and magnetic resonances simultaneously. Dielectric nanoparticles need to be deposited on various substrates in many applications. Understanding the substrate effect on the electromagnetic resonances of dielectric nanoparticles is of great importance for engineering their resonance properties and designing optical devices. In this study, moderate‐refractive‐index cuprous oxide nanospheres with uniform sizes and shapes are synthesized. The scattering spectra and images of the nanospheres deposited on three types of substrates are analyzed experimentally and theoretically. When supported on indium tin oxide–coated glass slides and Si wafers, the color of the nanospheres varies from blue, cyan, green, yellow, orange and red, covering almost the entire visible region. When deposited on gold films, the electromagnetic resonances of the nanospheres redshift intensively and a new effective magnetic resonance mode appears. The enhanced Raman scattering reveals that large electromagnetic field enhancements are produced in the gap region between the nanosphere and the substrate. The results shed light on the manipulation of the electromagnetic responses of dielectric nanoparticles and the design of dielectric metamaterials in the presence of various substrates.

中文翻译：

胶体Cu2O纳米球中的基质调节的电磁共振

介电纳米粒子有望在许多光学和光电应用中补充甚至替代等离激元纳米粒子，因为它们显示出小的吸收损耗并同时支持强电和磁共振。在许多应用中，介电纳米颗粒需要沉积在各种基底上。了解衬底对介电纳米粒子电磁谐振的影响对于设计其谐振特性和设计光学器件非常重要。在这项研究中，合成了具有均匀大小和形状的中等折射率的氧化亚铜纳米球。实验和理论上分析了三种类型的基板上沉积的纳米球的散射光谱和图像。当支撑在氧化铟锡涂层的载玻片和硅晶片上时，纳米球的颜色从蓝色，青色，绿色，黄色，橙色和红色不等，几乎覆盖了整个可见区域。当沉积在金膜上时，纳米球的电磁共振强烈地红移，并出现了新的有效磁共振模式。增强的拉曼散射表明，在纳米球与基材之间的间隙区域中产生了较大的电磁场增强。结果揭示了在存在各种基底的情况下介电纳米粒子的电磁响应的操纵和介电超材料的设计。纳米球的电磁共振强烈地红移，出现了新的有效磁共振模式。拉曼散射增强表明在纳米球和基底之间的间隙区域产生了较大的电磁场增强。结果揭示了在存在各种基底的情况下介电纳米粒子的电磁响应的操纵和介电超材料的设计。纳米球的电磁共振强烈地红移，出现了新的有效磁共振模式。拉曼散射增强表明在纳米球和基底之间的间隙区域产生了较大的电磁场增强。结果揭示了在存在各种基底的情况下介电纳米粒子的电磁响应的操纵和介电超材料的设计。

更新日期：2020-05-05

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