受激电光散射
Stimulated Electro-optic Scattering
- Department of Physics（物理系）
- University of Illinois at Urbana–Champaign（伊利诺伊大学厄巴纳-香槟分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文发现压电效应可通过线性电光散射及其互易过程显著重塑布里渊增益，并在铌酸锂波导中首次识别出纯电光受激散射，为光子-声子耦合工程提供了新自由度。
AI中文摘要：
受激布里渊散射（SBS）将光与声波耦合，支撑了从传感、信号处理到量子光子学等一系列应用。在固体中，这种相互作用通常归因于光弹性效应和介电边界的运动。在此，我们表明压电效应开辟了一条先前未被认识的新途径，能够显著重塑布里渊增益。这一贡献源于线性电光“泡克尔斯”散射及其互易的$\chi^{(2)}$介导的光驱动联合作用，它们将光场与压电体中伴随机械运动产生的电场耦合起来。我们将这些效应正式纳入现代SBS理论，并将其应用于单片铌酸锂波导。除了布里渊增益的大幅增强和抑制外，我们意外地发现在传统理论预测零布里渊相互作用的情况下出现了大增益。这些实例首次识别出纯电光SBS，我们将其称为受激电光散射，因为即使存在机械激发，该过程也只涉及电磁场之间的相互作用。我们的结果确立了电光张量作为压电介质中布里渊相互作用的关键控制参数，并为独立于光弹性和折射率对比度来工程化光子-声子耦合提供了新的自由度。
英文摘要：
Stimulated Brillouin Scattering (SBS) couples light to acoustic waves and underpins applications ranging from sensing and signal processing to quantum photonics. In solids, this interaction is generally attributed to photoelasticity and the motion of dielectric boundaries. Here we show that piezoelectricity opens an additional, previously unrecognized pathway that can substantially reshape Brillouin gain. This contribution arises from the combined action of linear electro-optic ``Pockels'' scattering and its reciprocal $χ^{(2)}$-mediated optical drive, which couple optical fields to the electric fields that accompany mechanical motion in piezoelectrics. We formally incorporate these effects into the modern theory of SBS and apply it to monolithic lithium niobate waveguides. In addition to large enhancement and suppression of the Brillouin gain, we surprisingly find occurrences of large gain where conventional theory would otherwise have predicted zero Brillouin interaction. These instances are the first identification of purely electro-optic SBS, a process we term stimulated electro-optic scattering, as it only involves interactions between electromagnetic fields even though a mechanical excitation is present. Our results establish the electro-optic tensor as a key governing parameter for Brillouin interactions in piezoelectric media and provide a new degree of freedom for engineering photon-phonon coupling independent of photoelasticity and index contrast.
