All-aluminum hierarchical plasmonic surfaces in the infrared
Date
2016Source Title
Optical Materials Express
Print ISSN
2159-3930
Publisher
The Optical Society
Volume
6
Issue
3
Pages
823 - 830
Language
English
Type
ArticleItem Usage Stats
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Abstract
All-Aluminum metal-insulator-metal resonator structures withmultiple metal-insulator stacks showing resonances in the mid-infrared(MIR) are fabricated. Ultrathin native Al2O3 is used as the insulator layersenabling simple fabrication of the resonator structures. The structures withtwo oxide layers exhibit two distinct resonances in the MIR. Simulation ofthese structures shows confinement of magnetic field to the thicker bottomoxide at the shorter wavelength resonance and to the thinner top oxide at theother resonance. Simulations of higher order hierarchical structures with 3 and 4 oxide layers show multispectral response with precise control of theoxide thicknesses. The studied structures show great potential for IRapplications that require durability and multispectral characteristics.
Keywords
AluminumResonance
Resonators
Aluminum metal
Hierarchical structures
Higher-order
Metal insulators
Multi-spectral
Precise control
Resonator structures
Shorter wavelength
Metal insulator boundaries