Fluctuations of the Casimir potential above a disordered medium Nicolas Cherroret, Romain Guérout, Astrid Lambrecht and Serge Reynaud Eur. Phys. J. D, 69 4 (2015) 99 Published online: 07 April 2015 DOI: 10.1140/epjd/e2015-50898-8