Feedback Cooling of a Cantilever’s Fundamental Mode below 5 mK

2007/02/20 by Martino Poggio, M. Poggio, Christian L. Degen +3 · 381 citations
Engineering · Physics and Astronomy · #Acoustics #Cantilever #Composite material #Force Microscopy Techniques and Applications #Interferometry #Materials science #Mechanical and Optical Resonators #Mode (computer interface) #Noise (video) #Optics #Optoelectronics #Photonic and Optical Devices #Physics #Shot noise #Silicon #cond-mat.other

paper · pdf · doi:10.1103/physrevlett.99.017201

published in Physical Review Letters 99(1), 017201 (American Physical Society) · 4 pages, 6 figures

arxiv created 2007/02/20 · openalex publication_date 2007/07/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We cool the fundamental mechanical mode of an ultrasoft silicon cantilever from a base temperature of 2.2 K down to 2.9+/-0.3 mK using active optomechanical feedback. The lowest observed mode temperature is consistent with limits determined by the properties of the cantilever and by the measurement noise. For high feedback gain, the driven cantilever motion is found to suppress or "squash" the optical interferometer intensity noise below the shot noise level.

Citations

• Suppression of classic and quantum radiation pressure noise by electro-optic feedback
• Putting Mechanics into Quantum Mechanics
• Experimental demonstration of in-loop intracavity intensity-noise suppression

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