Metal Nanoparticle Array as a Tunable Refractive Index Material over Broad Visible and Infrared Wavelengths,ACS Photonics

当前位置： X-MOL 学术 › ACS Photonics › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Metal Nanoparticle Array as a Tunable Refractive Index Material over Broad Visible and Infrared Wavelengths
ACS Photonics ( IF 6.5 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1021/acsphotonics.7b01497
Reehyang Kim ₁ , Kyungjae Chung ₂ , Ju Young Kim ₃ , Yunyong Nam ₁ , Sang-Hee Ko Park ₁ , Jonghwa Shin ₁

Affiliation

Common materials show a limited range of refractive indices over the visible and infrared wavelengths, and their values are not easily tunable once the material is chosen. Here, self-assembled metal nanoparticle arrays are proposed as an effective optical material with a large range of possible refractive indices that are nearly dispersionless over broad wavelength ranges. The material can be potentially fabricated over a large curved surface, and the resulting index is even more tunable by various postprocessing methods, such as material substitution or mechanical stretching. We achieve the highest refractive index of 5.0 at resonance in the visible, exceeding 4.2 over a broadband wavelength regime out of resonance. The key differences from previous studies of self-assembled metal particle arrays are the consideration of the diamagnetic effect and the careful choice of the ligands, which determine the gaps between particles. The sensitivity of the effective index to the size and material of the gap region allows the use of particle arrays also as an optical sensor of mechanical strain or the densities of analyte solutions with very small reaction volumes.

中文翻译：

金属纳米粒子阵列作为可见光和红外波长范围内的可调折射率材料

普通材料在可见光和红外波长范围内的折射率范围有限，一旦选择了该材料，它们的值就不容易调整。在此，提出了自组装金属纳米颗粒阵列作为一种有效的光学材料，其具有大范围的可能的折射率，该折射率在宽的波长范围内几乎没有分散。可以在较大的曲面上制造该材料，并且通过各种后处理方法（例如材料替换或机械拉伸）甚至可以更好地调整所得的折射率。我们在可见光共振处达到最高折射率5.0，在共振以外的宽带波长范围内超过4.2。与以前的自组装金属粒子阵列研究的主要不同之处在于，考虑了抗磁效应以及对配体的谨慎选择，这些决定了粒子之间的间隙。有效指数对间隙区域的尺寸和材料的敏感性允许将颗粒阵列也用作具有非常小的反应体积的机械应变或分析物溶液密度的光学传感器。

更新日期：2018-03-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11