Single photons on demand from 3D photonic band-gap structures M. Florescu, S. Scheel, H. Häffner, H. Lee, D. Strekalov, P. L. Knight and J. P. Dowling Europhys. Lett., 69 6 (2005) 945-951 Published online: 23 February 2005 DOI: 10.1209/epl/i2004-10453-5