Abstract
We demonstrate that Fano resonance and even multipole Fano resonance can be obtained in a symmetry‐reduced structure composed of gold bars with different bar sizes or bar shapes on a layer of dielectric. There is a transparency window opened within the frequency region of the absorptive dipole resonance by metallic bars, as long as the narrow grating waveguide mode induced by reducing symmetry is coincided in spectrum with the dipole resonance such that a destructive interference happens between these two resonant modes. Line shape of the transmission spectra of the nanostructure can be modulated effectively by changing the size or shape of the series of metal bars. The results found can be useful in the design of novel optical device.
Highlights
Fano resonance as a coherent phenomenon has emerged as a common characteristic of complex, coupled plasmon system [1]
It is demonstrated that Fano resonance even multipole Fano resonance appears in the transmission spectrum, and there is a transparency window opened within the frequency region of the absorptive dipole resonance by metallic bars, as long as the narrow grating waveguide mode induced by reducing symmetry is coincided in spectrum with the dipole resonance such that a destructive interference happens between these two resonant modes
The results may be helpful for the design of new optical device
Summary
Fano resonance as a coherent phenomenon has emerged as a common characteristic of complex, coupled plasmon system [1] This effect is important in the line shape engineering, and the frequency tunability of plasmonic nanosystems has been well established. Journal of Nanomaterials between two or more oscillators, they possess an inherent sensitivity to changes in geometry or local environment: small perturbations can induce dramatic resonance or line shape shifts. This property renders Fano resonant media attractive for a range of applications, such as the development of chemical or biological sensors. The results may be helpful for the design of new optical device
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