THz Technical Research Center of Shenzhen University, Shenzhen, 518060, China.
College of Electronic Science & Technology, Shenzhen University, Shenzhen, 518060, China.
Sci Rep. 2018 Jan 8;8(1):88. doi: 10.1038/s41598-017-18507-3.
We propose a scheme of metal/dielectric/metal waveguide for the enhanced forward stimulated Brillouin scattering (FSBS) in diamond that is mediated by gap surface plasmons. Numerical results based on finite-element method show that the maximum Brillouin gain in the small gap (~100 nm) can exceed 10 W m, which is three orders of magnitude higher than that in diamond-only waveguides. It is found that the radiation pressure that exists at the boundaries of metal and diamond plays a dominant role in contributing to the enhanced forward stimulated Brillouin gain, although electrostrictive forces interfere destructively. Detailed study shows that high FSBS gain can still be obtained regardless of the photoelastic property of the dielectric material in the proposed plasmonic waveguide. The strong photon-phonon coupling in this gap-surface-plasmon waveguide may make our design useful in the development of phonon laser, RF wave generation and optomechanical information processing in quantum system.
我们提出了一种金属/介质/金属波导方案，用于增强在金刚石中由间隙表面等离激元介导的正向受激布里渊散射（FSBS）。基于有限元法的数值结果表明，小间隙（~100nm）中的最大布里渊增益可超过 10W/m，比仅在金刚石中的波导高三个数量级。研究发现，金属和金刚石边界处存在的辐射压力在增强正向受激布里渊增益方面起着主导作用，尽管电致伸缩力会产生干扰。详细研究表明，无论在等离子体波导中介质材料的光弹性质如何，都可以获得较高的 FSBS 增益。在这种间隙表面等离激元波导中，强烈的光子-声子耦合可能使我们的设计在量子系统中的声子激光、射频波产生和光机械信息处理方面具有实用性。
