期刊
NANO LETTERS
卷 20, 期 10, 页码 7052-7058出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02113
关键词
Metamaterials; Time-Variant; Frequency Conversion; Ultrafast; Coupled Mode Theory
类别
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- Office of Naval Research [N00014-7-1-2161]
The color of light is a fundamental property of electromagnetic radiation; as such, control of the frequency is a cornerstone of modern optics. Nonlinear materials are typically used to generate new frequencies, however the use of time-variant systems provides an alternative approach. Utilizing a metasurface that supports a high-quality factor resonance, we demonstrate that a rapidly shifting refractive index will induce frequency conversion of light that is confined in the nanoresonator meta-atoms. We experimentally observe this frequency conversion and develop a time-dependent coupled mode theory model that well describes the system. The intersection of high quality-factor resonances, active materials, and ultrafast transient spectroscopy leads to the demonstration of metasurfaces operating in a time-variant regime that enables enhanced control over light-matter interaction.
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