title: Čerenkov-type second-harmonic spectroscopy in random nonlinear photonic structures.
abstract: We report on experimental and theoretical studies of Čerenkov-type second-harmonic generation in random nonlinear photonic structures with different two-dimensional distributions of the ferroelectric domains. We utilize Čerenkov-type second-harmonic generation spectroscopy to estimate the average ferroelectric domain size by analyzing the spatial Fourier spectrum of the domain patterns. This is measured by scanning the Čerenkov second-harmonic signal for different angles of incidence and light polarizations of the fundamental wave. By comparing the experimental results with numerically simulated Fourier spectra, the corresponding domain patterns are retrieved, which are in a good correspondence with images obtained by Čerenkov-type second-harmonic generation microscopy.
authors.affiliation: Institute of Applied Physics and Center for Nonlinear Science (CeNoS), University of Münster, Corrensstr. 2, 48149 Münster, Germany.
authors.forename: Mousa
authors.initials: M
authors.lastname: Ayoub
authors.forename: Philip
authors.initials: P
authors.lastname: Roedig
authors.forename: Kaloian
authors.initials: K
authors.lastname: Koynov
authors.forename: Jörg
authors.initials: J
authors.lastname: Imbrock
authors.forename: Cornelia
authors.initials: C
authors.lastname: Denz
mesh_terms: D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods*; D008853:Microscopy / Q000379:methods*; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D017785:Photons; D013057:Spectrum Analysis / Q000379:methods*