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Feedback-cooling the fundamental torsional mechanical mode of a tapered optical fiber to 30 mK

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arxiv 2301.07792 v3 pith:SDVA5TSE submitted 2023-01-18 physics.optics physics.ins-det

Feedback-cooling the fundamental torsional mechanical mode of a tapered optical fiber to 30 mK

Felix Tebbenjohanns , Jihao Jia , Michael Antesberger , Adarsh Shankar Prasad , Sebastian Pucher , Arno Rauschenbeutel , J\"urgen Volz , Philipp Schneeweiss This is my paper
classification physics.optics physics.ins-det
keywords opticalfundamentallightmechanicalmodequantumtaperedtorsional
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Tapered optical fibers (TOFs) are used in many areas of physics and optical technologies ranging from coupling light into nanophotonic components to optical sensing and amplification to interfacing quantum emitters. Here, we study the fundamental torsional mechanical mode of the nanofiber-waist of a TOF using laser light. We find that this oscillator features a quality factor of up to $10^7$ and a $Qf$ product of 1 THz. We damp the thermal motion from room temperature to 28(7) mK by means of active feedback. Our results might enable new types of fiber-based sensors and lay the foundation for a novel hybrid quantum optomechanical platform.

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