Properties of Zero Group Velocity in 2-dimensional Photonic Crystal

Zero-group-velocity modes in chalcogenide holey photonic-crystal fibers.

We demonstrate that a holey photonic-crystal fiber with chalcogenide-glass index contrast can be designed to have a complete gap at a propagation constant beta = 0 that also extends into the non-zero beta region. This type of bandgap (previously identified only at index contrasts unattainable in glasses) opens up a regime for guiding zero-group-velocity modes not possible in holey fibers with t...

Zero-velocity solitons in high-index photonic crystal fibers

Distinguishing zero-group-velocity modes in photonic crystals

We examine differences between various zero-group-velocity modes in photonic crystals, including those that arise from Bragg diffraction, anticrossings, and band repulsion. Zero-group velocity occurs at points where the group velocity changes sign, and therefore is conceptually related to “left-handed” media, in which the group velocity is opposite to the phase velocity. We consider this relati...

Negative group velocity pulse tunneling through a coaxial photonic crystal

An easily configurable experimental system is described in which negative group velocity tunneling of electrical pulses can be studied. Negative group velocity corresponds to the case in which the peak of a tunneled pulse exits before the peak of the incident pulse has entered the sample. In the experiments outlined herein, the tunneling occurs through the forbidden transmission region of a qua...

Zero-n̄ bandgap in photonic crystal superlattices

We demonstrate that photonic superlattices consisting of a periodic distribution of layers of materials with positive index of refraction and photonic crystal slabs that, at the operating frequency, have negative effective index of refraction present a photonic gap that corresponds to the frequency at which the spatial average of the refractive index distribution, taken over the unit supercell ...