High Q-Factor Hybrid Metamaterial Waveguide Multi-Fano Resonance Sensor in the Visible Wavelength Range

Abstract

We propose a high quality-factor (Q-factor) multi-Fano resonance hybrid metamaterial waveguide (HMW) sensor. By ingeniously designing a metal/dielectric hybrid waveguide structure, we can effectively tailor multi-Fano resonance peaks’ reflectance spectrum appearing in the visible wavelength range. In order to balance the high Q-factor and the best Fano resonance modulation depth, numerical calculation results demonstrated that the ultra-narrow linewidth resolution, the single-side quality factor, and Figure of Merit (FOM) can reach 1.7 nm, 690, and 236, respectively. Compared with the reported high Q-value (483) in the near-infrared band, an increase of 30% is achieved. Our proposed design may extend the application of Fano resonance in HMW from mid-infrared, terahertz band to visible band and have important research value in the fields of multi-wavelength non-labeled biosensing and slow light devices.

Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity

“…It should be pointed out that the multiple FRs generated by the "symmetry breaking" mechanism in plasmonic nanostructures usually have broad linewidths and need precisely controlled interparticle separation (on the order of several tens of nanometers) [22,24,49]. The linewidths of multiple FRs produced by the plasmonic dielectric-waveguide coupling mechanism can be largely decreased to~2 nm due to the non-radiative feature of the dielectric waveguide modes [29]. However, the features of planar structures, together with the relatively large vertical thickness, (the excitation of waveguide modes requiring the vertical thickness of dielectric layer larger than a critical value) are unfavorable for the device miniaturization [1].…”

“…In the first mechanism, the introduction of "symmetry breaking" into the plasmonic nanostructures enables the excitation of multipolar (high-order) dark plasmons, as well as the generation of multiple FRs, which is considered as the main strategy, reported in various plasmonic nanostructures [22][23][24][25][26][27]. The second mechanism for generating multiple FRs is through the coupling between plasmon and waveguide modes in hybrid plasmonic dielectric-waveguide structures [28,29]. This mechanism is capable of achieving the ultra-narrow (high-Q) FRs due to the non-radiative nature of the dielectric waveguide modes [29].…”

“…The second mechanism for generating multiple FRs is through the coupling between plasmon and waveguide modes in hybrid plasmonic dielectric-waveguide structures [28,29]. This mechanism is capable of achieving the ultra-narrow (high-Q) FRs due to the non-radiative nature of the dielectric waveguide modes [29]. More recently, the coupling between the plasmon modes, supported by the metallic nanostructure, and the multipolar (high-order) dark plasmonic modes, supported by the nanostructured graphene in the graphene-metal metamaterial, can also generate multiple FRs (the third mechanism) [30,31].…”

Ultranarrow and Tunable Fano Resonance in Ag Nanoshells and a Simple Ag Nanomatryushka

“…Engineering Fano resonance (FR) in plasmonic nanostrucures and artificial metamaterials has become an important research focus in recent years due to its wide applications such as surface-enhanced Raman scattering (SERS) [ 1 ], refractive-index sensing or biosensing sensors [ 2 , 3 , 4 , 5 , 6 , 7 ], plasmon rulers [ 8 ], molecular identification [ 9 ], slow-light devices [ 10 ], narrow-band absorbers [ 11 ], nonlinear optical processes [ 12 , 13 ], and so on. FR primally charcterized by the intrinsic sharp asymmetric line-shape in the far-field spectrum and the large electromagnetic field enhancement in the near-field, which results from the constuctive and destructive far-field interferences with strong interacitons between the narrow subradiant (dark) modes and the broad superradiant (bright) plasmon resonances [ 14 , 15 , 16 , 17 ].…”

Theoretical Study on Metasurfaces for Transverse Magneto-Optical Kerr Effect Enhancement of Ultra-Thin Magnetic Dielectric Films

“…Recently, obtaining the enhancement of magnetic fields in the visible frequency has become as important in nanophotonics as obtaining the enhancement of electric fields, stemming from many applications, for example, magnetic sensors or magnetic nonlinearity [1][2][3][4][5][6][7][8][9]. In the interactions between light and matter, the magnetic contribution of light can be neglected generally because it is too weak [10].…”