Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-02-23
Phys. Rev. Lett. 99, 010601 (2007)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.99.010601
The Brownian dynamics of an optically trapped water droplet are investigated across the transition from over to under-damped oscillations. The spectrum of position fluctuations evolves from a Lorentzian shape typical of over-damped systems (beads in liquid solvents), to a damped harmonic oscillator spectrum showing a resonance peak. In this later under-damped regime, we excite parametric resonance by periodically modulating the trapping power at twice the resonant frequency. The power spectra of position fluctuations are in excellent agreement with the obtained analytical solutions of a parametrically modulated Langevin equation.
Burnham Daniel R.
Di Leonardo Roberto
Girkin J. M.
Leach Javier
McGloin David
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