Picture of aircraft jet engine

Strathclyde research that powers aerospace engineering...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers involved in aerospace engineering and from the Advanced Space Concepts Laboratory - but also other internationally significant research from within the Department of Mechanical & Aerospace Engineering. Discover why Strathclyde is powering international aerospace research...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Parametric resonance of optically trapped aerosols

Leonardo, R. Di. and Ruocco, G. and Leach, J. and Padgett, M.J. and Wright, A. and Girkin, J.M. and Burnham, D.R. and McGloin, D. (2007) Parametric resonance of optically trapped aerosols. Physical Review Letters, 99 (1). 010601/1-010601/4. ISSN 0031-9007

[img]
Preview
PDF (strathprints005350.pdf)
strathprints005350.pdf

Download (463kB) | Preview

Abstract

The Brownian dynamics of an optically trapped water droplet are investigated across the transition from over- to underdamped 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 underdamped 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.