谐振电路微机械振荡器的被动冷却
Passive Cooling of a Micromechanical Oscillator with a Resonant Electric Circuit
摘要：
我们将微型悬臂梁电容耦合到一个驱动射频谐振电路中来冷却其基模。冷却结果从射频电容力，这是相移相对于悬臂运动。我们展示了冷却7 kHz的悬臂从室温到45 K的技术，获得合理的协议与模型的冷却，阻尼，和频移。将该方法扩展到低温系统中的更高频率可以实现基态冷却，并且可以证明比低温装置中的相关光学实验更简单。
英文摘要：
We cool the fundamental mode of a miniature cantilever by capacitively coupling it to a driven rf resonant circuit. Cooling results from the rf capacitive force, which is phase shifted relative to the cantilever motion. We demonstrate the technique by cooling a 7 kHz cantilever from room temperature to 45 K, obtaining reasonable agreement with a model for the cooling, damping, and frequency shift. Extending the method to higher frequencies in a cryogenic system could enable ground state cooling and may prove simpler than related optical experiments in a low temperature apparatus.
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