title: Omnidirectional phase matching of arbitrary processes by radial quasi-periodic nonlinear photonic crystal.
abstract: We investigate second-harmonic generation in a nonlinear photonic crystal having radial quasi-periodic order and continuous rotational symmetry. This device enables us to simultaneously phase match different nonlinear interactions in any arbitrary direction of propagation. We have fabricated such a crystal by electric field poling of a magnesium-doped stoichiometric LiTaO(3) and demonstrated frequency doubling of two different pump wavelengths at three different angles. Fourier coefficients were 10 times higher than that of a lattice-based multidirectional frequency doubler.
authors.affiliation: Department of Physical Electronics, School of Electrical Engineering, Fleishman Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel. noavoloch@gmail.com
authors.forename: Noa
authors.initials: N
authors.lastname: Voloch-Bloch
authors.forename: Tomer
authors.initials: T
authors.lastname: Davidovich
authors.forename: Tal
authors.initials: T
authors.lastname: Ellenbogen
authors.forename: Ayelet
authors.initials: A
authors.lastname: Ganany-Padowicz
authors.forename: Ady
authors.initials: A
authors.lastname: Arie