Superscattering, Superabsorption, and Nonreciprocity in Nonlinear Antennas,ACS Photonics

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Superscattering, Superabsorption, and Nonreciprocity in Nonlinear Antennas
ACS Photonics ( IF 6.5 ) Pub Date : 2021-02-01 , DOI: 10.1021/acsphotonics.0c01637
Lin Cheng _{1,

2} , Rasoul Alaee ₁ , Akbar Safari ₁ , Mohammad Karimi ₁ , Lei Zhang ₂ , Robert W. Boyd _{1,

3}

Affiliation

We propose tunable nonlinear antennas based on an epsilon-near-zero material with a large optical nonlinearity. We show that the absorption and scattering cross sections of the antennas can be controlled dynamically from a nearly superscatterer to a nearly superabsorber by changing the intensity of the laser. Moreover, we demonstrate that a hybrid nonlinear antenna, composed of epsilon-near-zero and dielectric materials, exhibits nonreciprocal radiation patterns because of broken spatial inversion symmetry and large optical nonlinearity of the epsilon-near-zero material. By changing the intensity of the laser, the radiation pattern of the antenna can be tuned between a bidirectional and a unidirectional emission known as a Huygens source. Our study provides a novel approach toward ultrafast dynamical control of metamaterials, for applications such as beam steering and optical limiting.

中文翻译：

非线性天线的超散射，超吸收和不可逆性

我们提出了一种基于具有大光学非线性的ε近零材料的可调非线性天线。我们表明，通过改变激光的强度，可以从近乎超级散射体到近乎超级吸收体动态地控制天线的吸收和散射截面。此外，我们证明了由零介电常数材料和介电材料组成的混合非线性天线，由于空间反转对称性的破坏和大的零介电材料光学非线性而表现出不可逆的辐射方向图。通过改变激光的强度，可以在被称为惠更斯源的双向和单向发射之间调整天线的辐射方向图。我们的研究为超快速动态控制超材料提供了一种新颖的方法，

更新日期：2021-02-17

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