Passive Cooling of a Micromechanical Oscillator with a Resonant Electric Circuit
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2007
- DOI:
- 10.1103/PhysRevLett.99.137205
- arXiv:
- arXiv:0705.1197
- Bibcode:
- 2007PhRvL..99m7205B
- Keywords:
-
- 85.85.+j;
- 05.40.Jc;
- Micro- and nano-electromechanical systems and devices;
- Brownian motion;
- Condensed Matter - Other;
- Quantum Physics
- E-Print:
- 4 pages, 4 figures