Zero-Group-Velocity Modes in Holey Photonic-Crystal Fibers

Technology #13574

Questions about this technology? Ask a Technology Manager

Download Printable PDF

Image Gallery
FIG. 1 is a schematic diagram illustrating a holey fiber used in accordance with the invention;FIGS. 2A-2B are schematic diagram illustrating the dispersion relation for various triangular lattice structures used in accordance with invention;FIGS. 3A-3D are schematic diagrams illustrating holey fibers having respective modes propagating in their cores;FIG. 4 is a graph illustrating the fraction of electric-field energy ε|E|2 in a hexagonal-shaped air core;
Professor John Joannopoulos
Department of Physics, MIT
Professor Steve Johnson
Department of Mathematics, MIT
Ardavan Farjadpour
Department of Mathematics, MIT
Managed By
Jim Freedman
MIT Technology Licensing Officer - Chemicals, Instruments, Consumer Products
Patent Protection

Zero group-velocity modes in chalcogenide holey photonic crystal fibers

US Patent 9,052,434


The technology is useful in solid, hollow and air core fibers used in gas-sensor, fiber-based sensor and fiber laser applications.

Problem Addressed

While photonic-crystal fiber-like geometries with high index contrast materials has been shown to support interesting zero group velocity modes, such modes has not been described for fibers made of easily drawable materials.


The invention shows a holey photonic-crystal fiber structure with chalcogenide-glass index contrast designed to have a complete gap at zero propagation constant that also extend into the non-zero beta region. This type of band gap opens up a regime for guiding zero group-velocity modes not possible in holey fibers with the more common finger-like gaps originating from beta to infinity. Such modes could be used to enhance nonlinear and other material interactions.


  • Creates well-localized zero-group velocity fiber modes
  • Applicable for a wide variety of fiber applications