Abstract
We report spectral splitting behaviors based on Fano resonances in a novel simple planar metasurface composed of gold nanobars and nanorings. Multiple plasmonic modes and sharp Fano effects are achieved in a broadband transmittance spectrum by exploiting the rotational symmetry of the metasurface. The transmission properties are effectively modified and tuned by modulating the structural parameters. The highest single side Q-factor and FoM which reaches 196 and 105 are observed at Fano resonances. Our proposed design is relatively simple and can be applied for various applications such as multi-wavelength highly sensitive plasmonic sensors, switching, and slow light devices.
Highlights
The collective oscillations of electrons in metallic nanostructures driven by an external electromagnetic field known as “surface plasmons” have received much attention at present due to their potential applications in biomedical imaging [1], sensing [2], cancer therapeutics [3], surface-enhanced spectroscopies [4,5], Salisbury screens [6,7], and energy harvesting [8]
We numerically investigated plasmonic spectral splitter based on Fano resonance effects
By accurately engineering geometrical parameters of the ring/rod metasurface, multiple plasmonic modes and Fano resonances are obtained in the spectrum
Summary
The collective oscillations of electrons in metallic nanostructures driven by an external electromagnetic field known as “surface plasmons” have received much attention at present due to their potential applications in biomedical imaging [1], sensing [2], cancer therapeutics [3], surface-enhanced spectroscopies [4,5], Salisbury screens [6,7], and energy harvesting [8]. The newly excited modes (which were dark before) can interact with the bright modes and induce plasmonic Fano-like resonances, which can be used for lasing, switching and slow light applications [21,22], and terahertz sensing [23,24] These multiple modes and Fano resonances extremely depend upon the geometry of the nanoparticle, size, and refractive index of the embedding medium [25]. Compared to the previous relevant art [34,35,36,37], in our designed structure highly interesting and sharp spectral signatures are investigated Such multiple resonances are effectively tuned by changing the parameters of the metasurface. The proposed metasurface may pave a new manner for the design of multi Fano-like spectrum splitter
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