Frequency Conversion in a Time-Variant Dielectric Metasurface
Frequency Conversion in a Time-Variant Dielectric Metasurface
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DOI：
10.1021/acs.nanolett.0c02113
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发表时间：
2020-10-14
期刊：
影响因子：
10.8
通讯作者：
Brener, Igal
中科院分区：
文献类型：
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作者：
Karl, Nicholas;Vabishchevich, Polina P.;Brener, Igal
光的颜色是电磁辐射的基本性质;因此，频率的控制是现代光学的基石。非线性材料通常用于产生新的频率，然而时变系统的使用提供了一种替代方法。利用支持高品质因数共振的超表面，我们证明了快速变化的折射率将引起被限制在纳米谐振器超原子中的光的频率转换。我们通过实验观察到这种频率转换，并开发了一个随时间变化的耦合模理论模型，很好地描述了系统。高品质因数共振，活性材料和超快瞬态光谱的交叉导致在时变制度，使增强控制光-物质相互作用的超表面操作的演示。
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.