Feng Yaming, Zhang Fangxing, Zheng Yuanlin, Chen Lei, Shen Dongyi, Liu Wei, Wan Wenjie
Opt Lett. 2019 May 1;44(9):2270-2273. doi: 10.1364/OL.44.002270.
Coherent excitation of phonons by optical waves, one of the most important channels for light-matter interactions, provides a promising route for optical manipulation of microscopic acoustic phonons for quantum opto-mechanic and phononic devices. Prior research, such as stimulated Brillouin scattering (SBS) in fibers, mainly emphasized phonon amplitude modulation; however, coherent phase control of these phonons has not yet been well explored. Here we experimentally demonstrate a new mechanism to coherently control acoustic phonon phases by a seeded SBS scheme in an optical fiber. Interference between acoustic phonons enables either nearly total transmission or enhanced reflection of optical waves, effectively controlled by phase modulation. This new technique addresses the crucial problem of phase-controlled phonon generation, paving the way for important applications in quantum opto-mechanic and phononic devices.
光波对声子的相干激发是光与物质相互作用最重要的通道之一，为量子光机械和声子器件中微观声子的光学操控提供了一条很有前景的途径。先前的研究，如光纤中的受激布里渊散射（SBS），主要强调声子幅度调制；然而，这些声子的相干相位控制尚未得到充分探索。在这里，我们通过实验证明了一种在光纤中利用种子SBS方案相干控制声子相位的新机制。声子之间的干涉使光波能够实现几乎完全透射或增强反射，通过相位调制可有效控制。这项新技术解决了相位控制声子产生的关键问题，为量子光机械和声子器件的重要应用铺平了道路。
