Optical bistability in Ag-Al2O3 one-dimensional photonic crystals Kandammathe Valiyaveedu Sreekanth, Alireza R. Rashed, Alessandro Veltri, Mohamed ElKabbash and Giuseppe Strangi EPL, 112 1 (2015) 14005 Published online: 23 October 2015 DOI: 10.1209/0295-5075/112/14005