论文标题
时间调节散射器中的参数MIE共振和定向扩增
Parametric Mie resonances and directional amplification in time-modulated scatterers
论文作者
论文摘要
我们通过球形粒子对光散射的理论描述，该粒子的介电性在及时的频率是入射光频率的两倍上调节。这样的粒子充当有限的光子时间晶体，尽管其亚波长度范围可以托管光学参数放大。得出球体中参数MIE共振的条件。我们表明，时间调制的材料提供了定制定向光放大的途径，与增益介质制成的散点机在质量上不同。我们设计了两个特征性的时间调节球，它们同时表现出光放大和所需的辐射模式，包括向后零和/或消失向前散射的辐射模式。后一个领域为创建无阴影探测器提供了机会。
We provide a theoretical description of light scattering by a spherical particle whose permittivity is modulated in time at twice the frequency of the incident light. Such a particle acts as a finite-sized photonic time crystal and, despite its sub-wavelength spatial extent, can host optical parametric amplification. Conditions of parametric Mie resonances in the sphere are derived. We show that time-modulated materials provide a route to tailor directional light amplification, qualitatively different from that in scatterers made from a gain media. We design two characteristic time-modulated spheres that simultaneously exhibit light amplification and desired radiation patterns, including those with zero backward and/or vanishing forward scattering. The latter sphere provides an opportunity for creating shadow-free detectors of incident light.
