A hybrid plasmonic-nanowire structure is proposed and investigated for generation of high-Q resonance and structural colors. Multiple localized surface plasmon resonance (LSPR) modes and plasmonic surface lattice resonance (SLR) modes are excited within the structure by introducing a thin gold layer on top of a titanium dioxide (TiO2) nanowires array. Nanowire arrays support diameter dependent resonant optical modes and when the wavelength of the optical resonance coincides with the plasmonic resonance, high-Q SLR modes are generated due to creation of Fano resonances. The LSPR modes create a resonance feature in the visible range. Thus, a wide range of vivid colors can be generated by this easy-to-fabricate structure via tuning geometrical parameters like the length and diameter of the nanowires and thickness of the plasmonic layer. A high Q of 233 is achieved with a low linewidth of 2.65 nm in the visible range. The proposed structure can be used to fabricate low-cost color sensors with self-referencing capability.
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