All-aluminum hierarchical plasmonic surfaces in the infrared

All-Aluminum metal-insulator-metal resonator structures with multiple metal-insulator stacks showing resonances in the mid-infrared (MIR) are fabricated. Ultrathin native Al2O3 is used as the insulator layers enabling simple fabrication of the resonator structures. The structures with two oxide layers exhibit two distinct resonances in the MIR. Simulation of these structures shows confinement of magnetic field to the thicker bottom oxide at the shorter wavelength resonance and to the thinner top oxide at the other resonance. Simulations of higher order hierarchical structures with 3 and 4 oxide layers show multispectral response with precise control of the oxide thicknesses. The studied structures show great potential for IR applications that require durability and multispectral characteristics. ©2016 Optical Society of America OCIS codes: (160.3918) Metamaterials; (240.6680) Surface plasmons; (260.5740) Resonance; (230.4555) Coupled resonators. References and links 1. T. Xu, A. 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