Engineering the magnetic plasmon resonances of metamaterials for high-quality sensing

Abstract

We present a powerful method to enhance the magnetic plasmon (MP) resonances of metamaterials composed of periodic arrays of U-shaped metallic split-ring resonators (SRRs) for high-quality sensing. We show that by suspending the metamaterials to reduce the effect of the substrate, the strong diffraction coupling of MP resonances can be achieved, which leads to a narrow-band mixed MP mode with a large magnetic field enhancement. It is also shown that for such a diffraction coupling, the magnetic field component of the lattice resonance mode of periodic arrays must be parallel to the induced magnetic moment in the metallic SRRs. Importantly, the sensitivity and the figure of merit (FOM) of the suspended metamaterials can reach as high as 1300 nm/RIU and 40, respectively. These results suggest that the proposed metamaterials may find great potential applications in label-free biomedical sensing.

Intelligent Metamaterials Based on Nonlinearity for Magnetic Resonance Imaging

“…[10,11] The capacity of metamaterials for electric field confinement has enabled the realization of a range of physical phenomena in metamaterials, such as electron emission [12] and phase transition in quantum materials. The ability of metamaterials to manipulate the magnetic field has enabled their applications to inductive wireless power transfer, [18] enhancement of the magneto-optic effect, [19] high-quality sensing, [20,21] plasmonic perfect absorption, [22] and magnetic field confinement, [23,24] among others. The ability of metamaterials to manipulate the magnetic field has enabled their applications to inductive wireless power transfer, [18] enhancement of the magneto-optic effect, [19] high-quality sensing, [20,21] plasmonic perfect absorption, [22] and magnetic field confinement, [23,24] among others.…”

“…[13] In turn, the electric field enhancement resulting from the near-field confinement leads to nonlinear responses in metamaterials that have been harnessed to enable high harmonic generation, [14] saturable absorption, [15] phase-conjugation, [16] and optical electrifying effects, [17] among other features.In addition to confining the electric field, metamaterials are capable of interacting with and efficiently tailoring the magnetic field. The ability of metamaterials to manipulate the magnetic field has enabled their applications to inductive wireless power transfer, [18] enhancement of the magneto-optic effect, [19] high-quality sensing, [20,21] plasmonic perfect absorption, [22] and magnetic field confinement, [23,24] among others. Another important application of the capacity for magnetic field manipulation is magnetic resonance imaging (MRI), which is the focus herein.…”

Plasmonic Refractive Index Sensing Based on Interference in Disordered Composite Films

“…The characteristics of surface plasmon oscillations strongly depend on the refractive index of the medium surrounding metal nanostructures, regardless of whether they are metal films or nanoparticles . Electromagnetic field enhancement and hence plasmonic sensing can be increased, for instance, using waveguide modes or magnetic resonances . Amid many schemes, plasmonic‐based chemical and biological sensing has been demonstrated using metal island films (MIFs), i.e., near 2D random distributions of metal nanoclusters that are formed during the first stages of metal deposition on dielectric surfaces .…”

Directional beaming of surface plasmon polaritons from a metallic nanochannels with defected surface cavity

“…[8][9][10][11] Owing to the above points, SPPs are suitable for various applications. For example, optical beaming, 12,13 filters, 14,15 optical logic gates, 16,17 sensors, [18][19][20][21][22][23][24] and waveguides 25,26 and that is just to name a few. In the visible spectrum region, the SPPs wavelength λ SPP is slightly less than the free space wavelength λ 0 .…”