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arXiv 1602.00205physics.optics
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线性波导中的布里渊冷却

Brillouin Cooling in a Linear Waveguide

Yin-Chung Chen, Seunghwi Kim, Gaurav Bahl

摘要:

由于斯托克斯散射在大多数实际系统中的热力学优势,布里渊散射通常不被认为是可以导致材料冷却的机制。然而,在谐振器上的实验中已经示出,通过反斯托克斯布里渊散射的净声子湮灭可以借助于合适的一组光学和声学状态来实现。另一方面,在线性波导中冷却行进的声子,可能导致操纵单向声子通量的令人兴奋的未来前景,甚至通过声子非互易传输量子信息。在这项工作中,我们提出了一个分析的条件下,低和高群速度的声子布里渊冷却可以实现在线性波导。我们分析了参与前向布里渊散射的光学模式和行进声学模式之间的三波混合相互作用,并揭示了该过程的关键操作机制。我们的计算表明,可测量的冷却可能会发生在一个系统中的声子的空间损失率是相同的顺序作为空间光学损失率。如果这种波导中的布里渊增益达到10 $^{5}$ m $^{-1}$ W $^{-1}$的量级,则可以用几mW的适度泵浦功率观察到声子模式的明显冷却。

英文摘要:

Brillouin scattering is not usually considered as a mechanism that can cause cooling of a material due to the thermodynamic dominance of Stokes scattering in most practical systems. However, it has been shown in experiments on resonators that net phonon annihilation through anti-Stokes Brillouin scattering can be enabled by means of a suitable set of optical and acoustic states. The cooling of traveling phonons in a linear waveguide, on the other hand, could lead to the exciting future prospect of manipulating unidirectional phonon fluxes and even the nonreciprocal transport of quantum information via phonons. In this work, we present an analysis of the conditions under which Brillouin cooling of phonons of both low and high group velocities may be achieved in a linear waveguide. We analyze the three-wave mixing interaction between the optical and traveling acoustic modes that participate in forward Brillouin scattering, and reveal the key regimes of operation for the process. Our calculations indicate that measurable cooling may occur in a system having phonons with spatial loss rate that is of the same order as the spatial optical loss rate. If the Brillouin gain in such a waveguide reaches the order of 10$^{5}$ m$^{-1}$W$^{-1}$, appreciable cooling of phonon modes may be observed with modest pump power of a few mW.

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