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Enhancement of second-harmonic generation in nonlinear nanolaminate metamaterials by nanophotonic resonances

Hsiao, H.H.; Abass, A.; Fischer, J.; Alaee, R.; Wickberg, A.; Wegener, M.; Rockstuhl, C.

Abstract (englisch): Nanolaminate metamaterials recently attracted a lot of attention as a novel second-order nonlinear material that can be used in integrated photonic circuits. Here, we explore theoretically and numerically the opportunity to enhance the nonlinear response from such nanolaminates by exploiting Fano resonances supported in grating-coupled waveguides. The enhancement factor of the radiated second harmonic signal compared to a flat nanolaminate can reach values as large as 35 for gold gratings and even 7000 for MgF2 gratings. For the MgF2 grating, extremely high-Q Fano resonances are excited in such all-dielectric system that result in strong local fields in the nonlinear waveguide layer to boost the nonlinear conversion. A significant portion of the nonlinear signal is also strongly coupled to a dark waveguide mode, which remains guided in the nanolaminate. The strong excitation of a dark mode at the second harmonic frequency provides a viable method for utilizing second-order nonlinearities for light generation and manipulation in integrated photonic circuits.

Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Institut für Nanotechnologie (INT)
Institut für Angewandte Physik (APH)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1364/OE.24.009651
ISSN: 1094-4087
URN: urn:nbn:de:swb:90-546747
KITopen ID: 1000054674
HGF-Programm 43.23.01; LK 01
Erschienen in Optics Express
Band 24
Heft 9
Seiten 9651-9659
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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