2014/11/30 by Mohamed A. K. Othman, Mohamed Othman, Farshad Yazdi +2 · 2 citations
Engineering · Physics and Astronomy · #Band diagram #Band gap #Degenerate energy levels #Enhanced Data Rates for GSM Evolution #Laser #Lasing threshold #Materials science #Optics #Optoelectronics #Photon #Photonic Crystals and Applications #Photonic and Optical Devices #Photonic crystal #Photonics #Physics #Plasmonic and Surface Plasmon Research #Telecommunications #physics.optics
paper · pdf · doi:10.1103/physrevb.93.024301
published as Physical Review B 93 (2), 024301, 2016 · 14 pages, 7 figures, version 3, Published in Physical Review B, 2015
arxiv created 2015/12/07 · openalex publication_date 2016/01/11 · arxiv updated 2016/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose a new approach leading to giant gain enhancement. It is based on unconventional slow-wave resonance associated with a degenerate band edge (DBE) in the dispersion diagram for a special class of photonic crystals supporting four modes at each frequency. We show that the gain enhancement in a Fabry-P'erot cavity (FPC) when operating at the DBE is several orders of magnitude stronger when compared to a cavity of the same length made of a standard photonic crystal with a regular band edge (RBE). The giant gain condition is explained by a significant increase in the photon lifetime and in the local density of states. We have demonstrated the existence of DBE operated special cavities that provide for superior gain conditions for solid-state lasers, quantum cascade lasers, traveling wave tubes, and distributed solid-state amplifiers. We also report the possibility to achieve low-threshold lasing in FPC with DBE compared to RBE-based lasers.