Photonic Bloch Oscillations and Zener Tunneling in Dual-Periodical Multilayers Made of Porous Silicon: Effect of Angle of Incidence

Experimental evidence of photon Bloch Oscillations (PBOs) and Zener tunneling (ZT) in dual-periodical (DP) superlattices made of porous silicon (PSi), is presented. An introduction of linear gradient in physical layer thicknesses in DP structure, composed by stacking two different periodic substructures N times, where (N-1) resonances appear, i.e, WSLs resonances and Zener tunneling of the nearest resonances of two consecutive minibands can be observed depending on the values of applied gradient. Theoretical time-resolved reflection and scattering state maps show photonic Bloch oscillations (BOs) and Zener tunneling for a range of incidence angles. Measured reflection reveals the presence of Wannier-Stark ladders (WSLs) and ZT in the near infrared region.