Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 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.)

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-09-02 , DOI: 10.1002/adom.202000877
Jinwu Dong ₁ , Shuai Chen ₁ , Guangfei Huang ₁ , Qiong Wu ₁ , Xiaocong Huang ₁ , Lingfei Wang ₁ , Yuan Zhang ₁ , Xianyu Ao ₁ , Sailing He _{1,

2,

3}

Affiliation

This article reports refractometric sensing using two optical resonances of different types supported by TiO₂ nanopillar arrays on a gold film, which can be exposed to aqueous or organic environments. One lattice resonance, with enhanced electric fields extending into the surrounding environment, can maintain a quality factor Q > 200 when the bulk refractive index of the surrounding environment varies in a large range from 1.33 to 1.58. This lattice resonance exhibits not only sharp transitions of reflected light intensity but also rapid phase changes. The other resonance is of plasmonic nature with electric fields localized on the metal surface. Small changes in the bulk refractive index or the adsorbate layer (thickness and index) can be detected, with sensitivity comparable to that of plasmonic counterparts. The present hybrid metal–dielectric platform is promising for applications requiring dielectric instead of metallic sensing surfaces.

中文翻译：

金属上的低折射率对比介电格，用于折射传感

本文报道了在金膜上使用TiO ₂纳米柱阵列支持的两种不同类型的光学共振进行的折光传感，这些金膜可以暴露于水性或有机环境。具有增强的电场扩展到周围环境的一种晶格共振可以保持品质因数Q当周围环境的整体折射率在1.33至1.58的较大范围内变化时，> 200。这种晶格共振不仅表现出反射光强度的急剧转变，而且表现出快速的相变。另一个共振具有等离激元性质，电场位于金属表面上。可以检测到总折射率或被吸附物层（厚度和折射率）的微小变化，其灵敏度可与等离激元对应物相比。当前的混合金属-电介质平台有望用于需要电介质而非金属感测表面的应用。

更新日期：2020-11-04

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