薄膜超流光学力学
Thin film superfluid optomechanics
摘要：
超流氦中的激发代表了腔光学力学方案的吸引人的机械自由度。在这里，我们数值和分析研究的性质形成的超流$^4$ He薄膜覆盖微米级回音壁模式腔的光机械谐振器。我们预测，通过适当的优化薄膜和光场之间的相互作用，大的光机耦合率$g_0>2π\times 100$ kHz和单光子合作率$C_0>10$是可以实现的。我们的分析模型揭示了这些薄膜的非常规行为，如较厚和较重的薄膜表现出较小的有效质量和较大的零点运动。这里概述的光学机械系统提供了访问不寻常的制度，如$g_0>Ω_M$，并打开了激光冷却液体到其量子基态的前景。
英文摘要：
Excitations in superfluid helium represent attractive mechanical degrees of freedom for cavity optomechanics schemes. Here we numerically and analytically investigate the properties of optomechanical resonators formed by thin films of superfluid $^4$He covering micrometer-scale whispering gallery mode cavities. We predict that through proper optimization of the interaction between film and optical field, large optomechanical coupling rates $g_0>2π\times 100$ kHz and single photon cooperativities $C_0>10$ are achievable. Our analytical model reveals the unconventional behaviour of these thin films, such as thicker and heavier films exhibiting smaller effective mass and larger zero point motion. The optomechanical system outlined here provides access to unusual regimes such as $g_0>Ω_M$ and opens the prospect of laser cooling a liquid into its quantum ground state.
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