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

Philipp Schneeweiss (HU Berlin)

Feb 14. 2023, 11:25 — 11:50

Tapered optical fibers (TOFs) are used in many areas, from the coupling of light onto optical chips to optical sensing and amplification to interfacing quantum emitters. Using laser light, we study the fundamental torsional mechanical mode of the nanofiber-waist of a TOF. We find that this oscillator features a quality factor of up to 10 million and a Qf product of 1 THz. We damp the thermal motion to temperatures as low as 28(7) mK by means of active feedback. Our results might enable a new type of a fiber-based sensor and lay the foundation for a novel hybrid quantum optomechanical platform.

Further Information
ESI Boltzmann Lecture Hall
Associated Event:
Blackbody Radiation Induced Effects and Phenomena (Workshop)
Philipp Haslinger (TU Vienna)
Francesco Intravaia (HU Berlin)
Arkadiusz Kosior (U of Innsbruck)
Dennis R├Ątzel (ZARM, Bremen)