2007/02/23 by Roberto Di Leonardo, R. Di Leonardo, Giancarlo Ruocco +13 · 3 citations
Computer Science · Engineering · Physics and Astronomy · #Atomic physics #Brownian motion #Harmonic #Harmonic oscillator #Langevin equation #Microfluidic and Bio-sensing Technologies #Noise (video) #Optics #Orbital Angular Momentum in Optics #Parametric oscillator #Parametric statistics #Physics #Position (finance) #Quantum Information and Cryptography #Quantum mechanics #Resonance (particle physics) #Spectral density #Statistical physics #Stochastic resonance #Trapping #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevlett.99.010601
published as Phys. Rev. Lett. 99, 010601 (2007) · 5 pages, 4 figures
arxiv created 2007/02/23 · openalex publication_date 2007/07/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.