纳米多孔金纳米片作为可调谐超材料。

Nanoporous gold nanoleaf as tunable metamaterial.

作者信息

Rout Sangeeta, Qi Zhen, Biener Monika M, Courtwright Devon, Adrien Jakeem C, Mills Ezekiel, Shahabuddin Mohammad, Noginova Natalia, Noginov Mikhail A

机构信息

Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, USA.

Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.

出版信息

Sci Rep. 2021 Jan 19;11(1):1795. doi: 10.1038/s41598-021-81128-4.

DOI:10.1038/s41598-021-81128-4

PMID:33469054

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7815877/

Abstract

We have studied optical properties of single-layer and multi-fold nanoporous gold leaf (NPGL) metamaterials and observed highly unusual transmission spectra composed of two well-resolved peaks. We explain this phenomenon in terms of a surface plasmon absorption band positioned on the top of a broader transmission band, the latter being characteristic of both homogeneous "solid" and inhomogeneous "diluted" Au films. The transmission spectra of NPGL metamaterials were shown to be controlled by external dielectric environments, e.g. water and applied voltage in an electrochemical cell. This paves the road to numerous functionalities of the studied tunable and active metamaterials, including control of spontaneous emission, energy transfer and many others.

摘要

我们研究了单层和多层纳米多孔金箔（NPGL）超材料的光学性质，并观察到由两个分辨率良好的峰组成的高度异常的透射光谱。我们根据位于较宽透射带顶部的表面等离子体吸收带来解释这一现象，后者是均匀“固体”和非均匀“稀释”金膜的特征。结果表明，NPGL超材料的透射光谱受外部介电环境的控制，例如电化学电池中的水和施加的电压。这为所研究的可调谐和有源超材料的众多功能铺平了道路，包括自发发射控制、能量转移等许多功能。