Second-harmonic generation via double topological valley-Hall kink modes in all-dielectric photonic crystals

Second harmonic generation in a photonic crystal

Second harmonic generation from the ‘centrosymmetric’ crystals

Second harmonic generation (SHG) is a well known non-linear optical phenomena which can be observed only in non-centrosymmetric crystals due to non-zero hyperpolarizability. In the current work we observed SHG from a Zn(II) complex which was originally thought to have crystallized in the centrosymmetric space group C2/c. This has been attributed to the unequal antiparallel packing of the metal ...

Huge enhancement of backward second-harmonic generation with slow light in photonic crystals

Rumen Iliew,1,2,* Christoph Etrich,3 Thomas Pertsch,3 Falk Lederer,2 and Yuri S. Kivshar1 1Nonlinear Physics Center, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia 2Institute of Condensed Matter Theory and Solid State Optics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany 3Institute of Applied Physics/Ultr...

Continuation Finite Element Simulation of Second Harmonic Generation in Photonic Crystals

A computational study on the enhancement of the second harmonic generation (SHG) in one-dimensional (1D) photonic crystals is presented. The mathematical model is derived from a nonlinear system of Maxwell’s equations, which partly overcomes the shortcoming of some existing models based on the undepleted pump approximation. We designed an iterative scheme coupled with the finite element method ...

Theoretical study on second-harmonic generation in two-dimensional nonlinear photonic crystals.

We theoretically study second-harmonic generation in two-dimensional nonlinear photonic crystals and obtain a unified expression that combines nonlinear Raman-Nath diffraction, Čerenkov-type second-harmonic generation, and nonlinear Bragg diffraction. The analytical solution is deduced, and the theoretical result coincides well with the nonlinear Raman-Nath, nonlinear Čerenkov, and nonlinear Br...