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Giant nonlinear magneto-optical response of magnetoplasmonic crystals

机译:磁等离子体晶体的超大非线性磁光响应

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摘要

Magnetoplasmonics provides unique possibilities for magnetic field control over light flow. A special interest in this field is attracted to magnetoplasmonic crystals (MPCs) that are nanostructured metal-dielectric materials with rich resonant spectra that can be tuned by a magnetic field. We show that MPC demonstrates enhanced nonlinear-optical effects such as optical second harmonic generation (SHG) and a giant nonlinear magneto-optical effect. Contrary to the linear-optical case, the main mechanism underlying the observed effects is the resonant enhancement of the local field achieved both for the surface-plasmon-polariton modes at metal/dielectric interfaces and for the waveguide modes in a dielectric slab, which provides an up to 25% magnetic field controlled SHG intensity variation. These effects are treated as an interplay of excitation of different modes that leads to Fano-type resonances in the nonlinear-optical response.
机译:磁等离子体能为光流的磁场控制提供独特的可能性。磁等离子体晶体(MPC)是该领域的一个特殊兴趣,它是纳米结构的金属介电材料,具有丰富的共振光谱,可以通过磁场进行调谐。我们表明,MPC表现出增强的非线性光学效应,例如光学二次谐波(SHG)和巨大的非线性磁光学效应。与线性光学情况相反,观察到的影响的主要机制是金属/电介质界面处的表面等离子体激元极化模式以及电介质平板中的波导模式均实现了局部场的共振增强。高达25%的磁场控制的SHG强度变化。这些效应被视为不同模式激发的相互作用,从而导致非线性光学响应中的Fano型共振。

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