论文标题
双轴双曲线范德华材料中的自发发射调制
Spontaneous emission modulation in biaxial hyperbolic van der Waals material
论文作者
论文摘要
作为天然的范德华晶体，α-MOO3具有出色的平面双曲线特性和必需的纳米光子化应用。但是，它的主动调谐特性通常被忽略。在这项工作中，我们首次使用旋转方法从单层平板上实现了自发发射的主动调制。数值结果和理论分析表明，α-MOO3在Y-Z或X-Y平面旋转时表现出良好的可调性。可以在634 cm-1处获得超过三个数量级的调制因子。但是，当旋转在X-Z平面中时，材料的自发发射表现出强角独立性。理论配方和物理机理分析很好地解释了上述现象。另外，对于半灭岩α-MOO3平坦结构，我们用波数和旋转角度给出自发发射的调制因子的分布。最后，我们将计算结果从半无限培养基扩展到有限的厚度膜。我们以厚度的厚度获得了调制因子峰角的一般演化定律，将调制因子增加到2000年左右。我们认为，本文的结果可以指导基于各向异性材料的自发发射的主动调制。
As a natural van der Waals crystal, α-MoO3 has excellent in-plane hyperbolic properties and essential nanophotonics applications. However, its actively tunable properties are generally neglected. In this work, we achieved active modulation of spontaneous emission from a single-layer flat plate using the rotation method for the first time. Numerical results and theoretical analysis show that α-MoO3 exhibits good tunability when rotated in the y-z or x-y plane. A modulation factor of more than three orders of magnitude can be obtained at 634 cm-1. However, when the rotation is in the x-z plane, the spontaneous emission of the material exhibits strong angle independence. The theoretical formulation and the physical mechanism analysis explain the above phenomenon well. In addition, for the semi-infinite α-MoO3 flat structure, we give the distribution of the modulation factor of spontaneous emission with wavenumber and rotation angle. Finally, we extended the calculation results from semi-infinite media to finite thickness films. We obtained the general evolution law of the peak angle of the modulation factor with thickness, increasing the modulation factor to about 2000. We believe that the results of this paper can guide the active modulation of spontaneous emission based on anisotropic materials.
