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Updated: Jun 13, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Cerenkov-type second-harmonic generation with fundamental beams of different polarizations
Yan Sheng1, Solomon M Saltiel, Wieslaw Krolikowski
1Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Abstract:
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.
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