Optically driven oscillations of ellipsoidal particles. Part I: Experimental observations B. M. Mihiretie, P. Snabre, J. -C. Loudet and B. Pouligny Eur. Phys. J. E, 37 12 (2014) 124 Published online: 22 December 2014 DOI: 10.1140/epje/i2014-14124-0