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Title: Stability of aerosol droplets in Bessel beam optical traps under constant and pulsed external forces

Abstract

We report on the dynamics of aerosol droplets in optical traps under the influence of additional constant and pulsed external forces. Experimental results are compared with simulations of the three-dimensional droplet dynamics for two types of optical traps, the counter-propagating Bessel beam (CPBB) trap and the quadruple Bessel beam (QBB) trap. Under the influence of a constant gas flow (constant external force), the QBB trap is found to be more stable compared with the CPBB trap. By contrast, under pulsed laser excitation with laser pulse durations of nanoseconds (pulsed external force), the type of trap is of minor importance for the droplet stability. It typically needs pulsed laser forces that are several orders of magnitude higher than the optical forces to induce escape of the droplet from the trap. If the droplet strongly absorbs the pulsed laser light, these escape forces can be strongly reduced. The lower stability of absorbing droplets is a result of secondary thermal processes that cause droplet escape.

Authors:
; ; ; ; ;  [1]
  1. Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22415681
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 142; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AEROSOLS; BESSEL FUNCTIONS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DROPLETS; EXCITATION; GAS FLOW; PHASE STABILITY; STABILITY; THREE-DIMENSIONAL LATTICES; TRAPS; VISIBLE RADIATION

Citation Formats

David, Grégory, Esat, Kıvanç, Hartweg, Sebastian, Cremer, Johannes, Chasovskikh, Egor, and Signorell, Ruth. Stability of aerosol droplets in Bessel beam optical traps under constant and pulsed external forces. United States: N. p., 2015. Web. doi:10.1063/1.4917202.
David, Grégory, Esat, Kıvanç, Hartweg, Sebastian, Cremer, Johannes, Chasovskikh, Egor, & Signorell, Ruth. Stability of aerosol droplets in Bessel beam optical traps under constant and pulsed external forces. United States. https://doi.org/10.1063/1.4917202
David, Grégory, Esat, Kıvanç, Hartweg, Sebastian, Cremer, Johannes, Chasovskikh, Egor, and Signorell, Ruth. 2015. "Stability of aerosol droplets in Bessel beam optical traps under constant and pulsed external forces". United States. https://doi.org/10.1063/1.4917202.
@article{osti_22415681,
title = {Stability of aerosol droplets in Bessel beam optical traps under constant and pulsed external forces},
author = {David, Grégory and Esat, Kıvanç and Hartweg, Sebastian and Cremer, Johannes and Chasovskikh, Egor and Signorell, Ruth},
abstractNote = {We report on the dynamics of aerosol droplets in optical traps under the influence of additional constant and pulsed external forces. Experimental results are compared with simulations of the three-dimensional droplet dynamics for two types of optical traps, the counter-propagating Bessel beam (CPBB) trap and the quadruple Bessel beam (QBB) trap. Under the influence of a constant gas flow (constant external force), the QBB trap is found to be more stable compared with the CPBB trap. By contrast, under pulsed laser excitation with laser pulse durations of nanoseconds (pulsed external force), the type of trap is of minor importance for the droplet stability. It typically needs pulsed laser forces that are several orders of magnitude higher than the optical forces to induce escape of the droplet from the trap. If the droplet strongly absorbs the pulsed laser light, these escape forces can be strongly reduced. The lower stability of absorbing droplets is a result of secondary thermal processes that cause droplet escape.},
doi = {10.1063/1.4917202},
url = {https://www.osti.gov/biblio/22415681}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 15,
volume = 142,
place = {United States},
year = {Tue Apr 21 00:00:00 EDT 2015},
month = {Tue Apr 21 00:00:00 EDT 2015}
}