Orbital angular momentum mode division filtering for photon-phonon coupling.
Orbital angular momentum mode division filtering for photon-phonon coupling.
复制标题
光子-声子耦合的轨道角动量模式分割滤波
DOI：
10.1038/srep40526
复制
发表时间：
2017-01-10
影响因子：
4.6
通讯作者：
Gao W
中科院分区：
文献类型：
--
作者：
Zhu ZH;Sheng LW;Lv ZW;He WM;Gao W
受激布里渊散射(SBS)是一种发生在任何透明材料中的光波和声波之间的基本的非线性相互作用，近几十年来得到了广泛的研究，并在集成光子学中取得了快速的进展。然而，由于介质中光子与自发非相干声子之间的不必要耦合而产生的SBS噪声是不可避免的。在这里，我们提出并实验证明，这一障碍可以通过一种称为轨道角动量模式分割滤波的方法来克服。由于引入了一种新的可分辨自由度，即使是极弱的信号也可以被区分出来，并与SBS过程中产生的强噪声分开。该机制为准无噪声的光子-声子工作提供了一种实用的方法，在支持多正交空间模的光波导中仍然有效，为未来的SBS器件提供了更大的灵活性和健壮性。
Stimulated Brillouin scattering (SBS), a fundamental nonlinear interaction between light and acoustic waves occurring in any transparency material, has been broadly studied for several decades and gained rapid progress in integrated photonics recently. However, the SBS noise arising from the unwanted coupling between photons and spontaneous non-coherent phonons in media is inevitable. Here, we propose and experimentally demonstrate this obstacle can be overcome via a method called orbital angular momentum mode division filtering. Owing to the introduction of a new distinguishable degree-of-freedom, even extremely weak signals can be discriminated and separated from a strong noise produced in SBS processes. The mechanism demonstrated in this proof-of-principle work provides a practical way for quasi-noise-free photonic-phononic operation, which is still valid in waveguides supporting multi-orthogonal spatial modes, permits more flexibility and robustness for future SBS devices.