Kolmychek I A, Mamonov E A, Gusev N S, Sapozhnikov M V, Golubev V G, Murzina T V
Opt Lett. 2021 Jul 1;46(13):3087-3090. doi: 10.1364/OL.427965.
Plasmonic structures are extremely attractive for the light flow manipulation. In turn, the spectrum of the plasmon excitations can be controlled by external magnetic field, thus giving rise to magnetoplasmonics. However, in the case of traditional magnetoplasmonic structures, the enhancement of magneto-optical (MO) effects is often accompanied by the transmission damp, which constricts the area of their applications. This paper examines resonant optical effects in composite structures based on artificial opal films covered by a thin cobalt layer, which forms a 2D hexagonal lattice of nanoholes in the metal film. Such periodic structure exhibits surface plasmon polariton-assisted extraordinary transmission along with the increase of odd in magnetization intensity magnetooptical effect in the Voigt geometry. Local field enhancement accompanying the surface plasmon polaritons excitation in composite Co/opal structure provides a distinct enhancement of the magnetization-induced second harmonic generation (SHG) and relevant MO effects at the SHG wavelength that appear as Fano-type resonances. High transmission along with resonantly-high MO effects make Co/opal films promising in plasmonic applications.
等离子体结构对于光流操纵极具吸引力。反过来，等离子体激发光谱可由外部磁场控制，从而产生磁等离子体学。然而，在传统磁等离子体结构的情况下，磁光（MO）效应的增强往往伴随着传输损耗，这限制了它们的应用领域。本文研究了基于覆盖有薄钴层的人工蛋白石薄膜的复合结构中的共振光学效应，该钴层在金属薄膜中形成二维六边形纳米孔晶格。这种周期性结构在Voigt几何结构中表现出表面等离激元极化子辅助的超常传输以及磁化强度磁光效应中奇数项的增加。复合Co/蛋白石结构中伴随表面等离激元极化子激发的局部场增强，在作为Fano型共振出现的二次谐波产生（SHG）波长处，显著增强了磁化诱导的二次谐波产生（SHG）及相关的MO效应。高传输以及共振增强的MO效应使得Co/蛋白石薄膜在等离子体应用中具有前景。
