Cerenkov-type second-harmonic generation with fundamental beams of different polarizations.
We analyze the conical second-harmonic generation via Cerenkov-type phase matching in two-dimensional decagonal nonlinear photonic quasi-crystals for linear, circular, and elliptical polarized fundamental beams. Depending on the polarization state, we observe either centrosymmetric or noncentrosymmetric intensity modulation of the second-harmonic rings. We explain this effect by employing the concept of effective quadratic nonlinearity combined with the hexagonal symmetry of the individual ferroelectric domains.
Sheng
Yan
Y
Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Saltiel
Solomon M
SM
Krolikowski
Wieslaw
W
Arie
Ady
A
Koynov
Kaloian
K
Kivshar
Yuri S
YS