Force sensing with a shaped dielectric micro-tool D. B. Phillips, S. H. Simpson, J. A. Grieve, R. Bowman, G. M. Gibson, M. J. Padgett, J. G. Rarity, S. Hanna, M. J. Miles and D. M. Carberry EPL, 99 5 (2012) 58004 Published online: 13 September 2012 DOI: 10.1209/0295-5075/99/58004