论文标题
在集成光子波导中机电加固的布里鲁因散射的理论框架
A Theoretical Framework for Electromechanically Reinforced Brillouin Scattering in Integrated Photonic Waveguides
论文作者
论文摘要
当前由中央对称材料组成的波导中刺激的布里鲁因散射（SB）的当前理论证明不会捕获由非中心对称材料组成的波导中现象的物理。后一个问题中的SB需要由于压电性而导致的电波和声波的相互耦合，并且最终与中心对称材料中的功率转换方程最终达到了不同的功率转换方程。在这项研究中，从理论上讲，当由数字间变形剂激发时，我们用非中心对称材料研究了芯片规模的波导中的布里鲁因散射。我们解释了如何在外部注入的声波存在下制定布里鲁因散射。另外，我们还证明了该外部信号对加强刺激的布里鲁因散射的影响。作为一个案例研究，我们研究了砷耐加盐炮中的SBS。结果表明，由于该波导中机电增强的SBS引起的Stokes扩增可以比硅纳米线中SBS报告的值高几个数量级。这可以减少给定的Stokes扩增所需的波导长度，从厘米到几百微米。
Current theoretical demonstration of the Stimulated Brillouin scattering (SBS) in waveguides composed of centrosymmetric materials does not capture physics of the phenomenon in waveguides composed of non-centrosymmetric materials. The SBS in the latter problem, entails mutual coupling of the electric and acoustic waves due to piezoelectricity, and ends up to a different power conversion equation than that in a centrosymmetric material. In this study, we theoretically investigate Brillouin scattering in chip-scale waveguides with non-centrosymmetric material when excited by an Inter-Digital-Transducer. We explain how Brillouin scattering is formulated in the presence of externally injected acoustic waves. Also we demonstrate the effect of this external signal on reinforcing Stimulated Brillouin scattering. As a case study we study SBS in a gallium arsenide nonowire. It is shown that the Stokes amplification due to electromechanically reinforced SBS in this waveguide can grow several orders of magnitude higher than the values reported for the SBS in a silicon nanowire; This enables reducing the waveguide length required for a given Stokes amplification from centimeters to few hundred micrometers.
