Second-Harmonic Generation by 3D Laminate Metacrystals
Journal
Advanced Optical Materials
Journal Volume
7
Journal Issue
14
Date Issued
2019
Author(s)
Abstract
3D dielectric woodpile photonic crystals, which are conformally coated with locally noninversion-symmetric dielectric laminate metamaterials, are discussed. These “3D laminate metacrystals” are fabricated by 3D direct laser writing of an acrylate without photoinitiator to reduce two-photon-induced fluorescence, followed by atomic-layer deposition of alternating layers of Al2O3 and ZnO. Resonant enhancements of second-harmonic generation under normal incidence of light of up to two orders of magnitude with respect to the same laminate metamaterial on a glass substrate under oblique incidence of light are found experimentally. The nonlinear optical resonances in the range of 800–1020 nm fundamental wavelength are explained theoretically in terms of 3D photonic crystal slab guided resonances, leading to pronounced local-field-enhancement effects. Numerical calculations reproduce the salient features of the experiments and yield second-harmonic enhancement factors yet larger than the experiment due to the absence of spectral and angular averaging. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Subjects
metamaterials; nonlinear optics; photonic crystals
Other Subjects
Alumina; Aluminum oxide; Atomic layer deposition; Harmonic analysis; Harmonic generation; II-VI semiconductors; Light; Metamaterials; Photonic crystals; Quantum optics; Substrates; Zinc oxide; 3D photonic crystals; Direct laser writing; Fundamental wavelength; Local field enhancement; Nonlinear optical resonance; Numerical calculation; Resonant enhancements; Two-photon-induced fluorescence; Nonlinear optics
Type
journal article