Application of photonic crystal effective index model for defining single-mode conditions in PCSELs

Summary form only given. The present paper focuses on the theoretical background of single-mode operation in VCSELs with incorporated photonic crystals - Photonic Crystal Surface-Emitting Lasers (PCSELs). This work provides direct identification of the waveguiding mode by computation of the normalized propagation constant B which shows the fraction of the optical mode guided by the core region. We present a design rule for hole diameter and pitch values where true single-mode oscillations of PCSELs should be found.