Three-dimensional imaging and force characterization of multiple trapped particles in low NA counterpropagating optical trapsT. B. Lindballe, M. V. Kristensen, A. P. Kylling, D. Z. Palima, J. Glückstad, S. R. Keiding and H. StapelfeldtJ. Eur. Opt. Soc.-Rapid Publ., 6 (2011) 11057DOI: https://doi.org/10.2971/jeos.2011.11057
