Department of Physics
Laser induced surface stress on water droplets
© 2014 Optical Society of America.Laser induced stress on spherical water droplets is studied. At mechanical equilibrium, the body stress vanishes therefore we consider only the surface stress. The surface stress on sub-wavelength droplets is slightly weaker along the light propagation direction. For larger droplets, due to their light focusing effect, the forward stress is significantly enhanced. For a particle roughly 3 micron in radius, when it is excited at whispering gallery mode with Q ∼ 104 by a 1 Watt Gaussian beam, the stress can be enhanced by two orders of magnitude, and can be comparable with the Laplace pressure.
Source Publication Title
Optical Society of America
Link to Publisher's Edition
Wang, Neng, Zhifang Lin, and Jack Ng. "Laser induced surface stress on water droplets." Optics Express 22.20 (2014): 23770-23775.