Abstract
Modeling and tailoring of multispectral Fano resonance in plasmonic system employing nanoslit-antenna array is demonstrated and investigated. Efficient control of the multiple Fano profile can be manipulated, where the overall spectral is achieved by the separate contributions from the fundamental subgroups plasmonic resonance eigenstates. A polarization-selective strategy on nano-antennas resonance is proposed to shed light on the efficient manipulation of the multiple Fano resonances. Theory prediction of TM−1 surface mode excited in the system and thorough dispersion analysis of the supported Bloch modes provides evidence for understanding the origin of the transmission spectra. Compact nanophotonics planar optical linear-polarizer in the proposed nanostructure is investigated and demonstrated, where flexible Fano resonance control over the profile, linewidth and spectral contrast is appealing for applications such as sensing, switches and multifunctional nanophotonics devices.
Highlights
Fano resonance in plasmonic system has been widely investigated, which has attracted vast scientific interest for their abilities to steer electromagnetic fields by tailoring of the subwavelength features and varied plasmonic resonances states[1,2,3,4,5,6,7,8,9,10]
The tailoring of the nanoslits antenna resonance unit, the hybridization and combination of the slits resonance provide the multispectral resonance with notable tunable features, where gradually modulated “on” and “off ” states can be obtained by switching incidence light polarization
The dielectric constants of gold is fitted by Drude-Lorentz model[27,28] and the refractive index of the substrate and the waveguide layer are set as ns = 1.52 and nw g = 2.1, respectively
Summary
Fano resonance in plasmonic system has been widely investigated, which has attracted vast scientific interest for their abilities to steer electromagnetic fields by tailoring of the subwavelength features and varied plasmonic resonances states[1,2,3,4,5,6,7,8,9,10]. Recent approaches are reported exploiting phase-change materials employing vanadium oxide and germanium-antimony-tellurium (GeSbTe/GST), which have refractive indices that changes in response to external electronic or thermal biasing This external modulation approach is potentially efficient and convenient; the overall tuning on the resonance profile’s linewidth and strength is gradually manipulated. The tailoring of the nanoslits antenna resonance unit, the hybridization and combination of the slits resonance provide the multispectral resonance with notable tunable features, where gradually modulated “on” and “off ” states can be obtained by switching incidence light polarization Such a coupling strategy for tailored spectral resonance can serve as platform for programmable visible, infrared and terahertz plasmonic devices and metasurface for on-chip photonic manipulation and modulation applications. The polarization-selective transmission of the system exhibits quite well trends of the Malus Law, which implies potential and possibility for promising multifunctional compact optical elements applications
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