Magnetoplasmonic Quasicrystals

Nanostructured magneto-optical materials sustaining optical resonances open very efficient way for light control via magnetic field, which is of prime importance for telecommunication and sensing applications. However, usually their response is narrowband due to its resonance character. Here we demonstrate and investigate a novel type of the magnetoplasmonic structure, the magnetoplasmonic quasicrystal, which demonstrates unique magneto-optical response. It consists of the magnetic dielectric film covered by a thin gold layer perforated by slits forming a Fibonacci-like binary sequence. The transverse magneto-optical Kerr effect (TMOKE) acquires controllable multiple plasmon-related resonances resulting in a magneto-optical response in a wide frequency range. The broadband TMOKE is valuable for numerous nanophotonics applications including optical sensing, control of light, all-optical control of magnetization etc. On the other hand, TMOKE spectroscopy is an efficient tool for investigation of the peculiarities of plasmonic quasicrystals.