Eliminating excess phase accumulation in a continuous perturbed heterogeneous planar photonic crystal

Moradi S., Zavvari M., Zehforoosh Y., Arashmehr A., Bornemann J.

PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS, vol.48, 2022 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 48
  • Publication Date: 2022
  • Doi Number: 10.1016/j.photonics.2021.100985
  • Journal Indexes: Science Citation Index Expanded, Scopus, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC
  • Keywords: Excess phase accumulation, Continuous perturbation, Planar photonic crystal, Negative group delay, TM, TE


We propose an asymmetric distribution of a hexagonal lattice for achieving near-zero group velocity with negative group delay. This study reports the effect of the continuous geometric perturbation on the photonic band diagram and consequently its impact on phase velocity, group velocity, and effective refractive index. We provide a promising method for modifying the photonic band diagram to obtain an exotic dispersion diagram. With this broadband spanning from the E band to the L band, the light pulse envelope travels with almost zero velocity and is promising for application in a wide variety of light-based devices.