Structured porous silicon sub-micrometer wells grown by colloidal lithography M. Manso Silván, M. Arroyo Hernández, V. Torres Costa, R. J. Martín Palma and J. M. Martínez Duart Europhys. Lett., 76 4 (2006) 690-695 Published online: 20 October 2006 DOI: 10.1209/epl/i2006-10331-2