Helical and Linear Distributed Feedback Lasers

Electrically Switchable, One‐Dimensional Polymeric Resonators from Holographic Photopolymerization: A New Approach for Active Photonic Bandgap Materials

“…Modes near the bandgap edge have nearly zero group velocity, which leads to a high density of states. In an infinite one-dimensional structure the density of states (D(x)) has Van Hove singularities at the band extrema: [24] D…”