Phoxonic Band Gaps in Porous Silicon Multilayers at Frequencies of the Visible and Hypersound

Abstract

We report on the occurrence of the simultaneous existence of Photonic and Phononic Band Gaps in Porous Silicon Multilayers (PSM) with modulation in the range of 40-167 nm. We present rigorous electrodynamic and elastodynamics calculations of the eigenvalues of the wave equations for electromagnetic and longitudinal (transverse) mechanical vibrations. PSM are identified as PhoXonic structures exhibiting ranges of forbidden frequencies for ultraviolet/visible light and hypersound.