Details

Autor(en) / Beteiligte

• Zalalutdinov, M.
• Zehnder, A.
• Olkhovets, A.
• Turner, S.
• Sekaric, L.
• Ilic, B.
• Czaplewski, D.
• Parpia, J. M.
• Craighead, H. G.

Titel

Autoparametric optical drive for micromechanical oscillators

Ist Teil von

• Applied physics letters, 2001-07, Vol.79 (5), p.695-697

Erscheinungsjahr

2001

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Self-generated vibration of a disk-shaped, single-crystal silicon micromechanical oscillator was observed when the power of a continuous wave laser, focused on the periphery of the disk exceeded a threshold of a few hundred μW. With the laser power set to just below the self-generation threshold, the quality factor for driven oscillations increases by an order of magnitude from Q=10 000 to Qenh=110 000. Laser heating-induced thermal stress modulates the effective spring constant via the motion of the disk within the interference pattern of incident and reflected laser beams and provides a mechanism for parametric amplification and self-excitation. Light sources of different wavelengths facilitate both amplification and damping.