Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201801235
Keywords
metamaterials; nonlinear optics; photonic crystals
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Funding
- Helmholtz program Science and Technology of Nanosystems (STN)
- KIT Nanostructure Service Laboratory (NSL)
- Karlsruhe School of Optics & Photonics (KSOP)
- Ministry of Science and Technology of Taiwan [MOST107-2112-M-003-013-MY3]
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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.
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