
Proceedings Paper
Parametric excitation of optically trapped aerosolsFormat | Member Price | Non-Member Price |
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Paper Abstract
The Brownian dynamics of an optically trapped water droplet is investigated across the transition from over to
under-damped oscillations. The spectrum of position fluctuations evolves from a Lorentzian shape typical of overdamped
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. We also derive from Langevin dynamics an explicit numerical recipe
for the fast computation of the power spectra of a Brownian parametric oscillator. The obtained numerical
predictions are in excellent agreement with the experimental data.
Paper Details
Date Published: 5 September 2007
PDF: 9 pages
Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66441J (5 September 2007); doi: 10.1117/12.736448
Published in SPIE Proceedings Vol. 6644:
Optical Trapping and Optical Micromanipulation IV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
PDF: 9 pages
Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66441J (5 September 2007); doi: 10.1117/12.736448
Show Author Affiliations
R. Di Leonardo, INFM CRS SOFT, Univ. di Roma (Italy)
G. Ruocco, INFM CRS SOFT, Univ. di Roma (Italy)
J. Leach, Univ. of Glasgow (United Kingdom)
M. J. Padgett, Univ. of Glasgow (United Kingdom)
G. Ruocco, INFM CRS SOFT, Univ. di Roma (Italy)
J. Leach, Univ. of Glasgow (United Kingdom)
M. J. Padgett, Univ. of Glasgow (United Kingdom)
A. J. Wright, Univ. of Strathclyde (United Kingdom)
J. M. Girkin, Univ. of Strathclyde (United Kingdom)
D. R. Burnham, Univ. of St. Andrews (United Kingdom)
Univ. of Dundee (United Kingdom)
D. McGloin, Univ. of St. Andrews (United Kingdom)
Univ. of Dundee (United Kingdom)
J. M. Girkin, Univ. of Strathclyde (United Kingdom)
D. R. Burnham, Univ. of St. Andrews (United Kingdom)
Univ. of Dundee (United Kingdom)
D. McGloin, Univ. of St. Andrews (United Kingdom)
Univ. of Dundee (United Kingdom)
Published in SPIE Proceedings Vol. 6644:
Optical Trapping and Optical Micromanipulation IV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
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