Frequency Conversion in a Time-Variant Dielectric Metasurface.,Nano Letters

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Frequency Conversion in a Time-Variant Dielectric Metasurface.
Nano Letters ( IF 9.6 ) Pub Date : 2020-09-17 , DOI: 10.1021/acs.nanolett.0c02113
Nicholas Karl _{1,

2} , Polina P Vabishchevich _{1,

2} , Maxim R Shcherbakov ₃ , Sheng Liu _{1,

2} , Michael B Sinclair ₁ , Gennady Shvets ₃ , Igal Brener _{1,

2}

Affiliation

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.

中文翻译：

随时间变化的介电超表面中的频率转换。

光的颜色是电磁辐射的基本属性。因此，频率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，但是使用时变系统提供了另一种方法。利用支持高质量因子共振的超颖表面，我们证明了快速变化的折射率将引起纳米共振子超颖原子内受限光的频率转换。我们通过实验观察这种频率转换，并开发了一个很好的描述系统的时间相关的耦合模式理论模型。高品质因数共振，活性材料，

更新日期：2020-10-15

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