Fano-like resonance in large-area magnetic metamaterials fabricated by the nanoimprint technique

Abstract

We experimentally and theoretically investigated the Fano-like resonance in large-area magnetic metasurfaces fabricated by nanoimprint lithography techniques based on elaborately designed Ag–SiN–Ag configuration. Asymmetric line shape is revealed in the reflection spectrum of magnetic metamaterials. The physical mechanism is elucidated through dispersion relation and electromagnetic field distribution analysis. Both the measured and calculated dispersion relation tell that there are magnetic resonance modes and surface lattices modes coexisting in magnetic metamaterials, their coupling leads to the asymmetric profile in the reflection spectrum. The calculated electromagnetic field distribution further consolidate the coupling phenomenon in the magnetic metamaterials. This work might significantly prompt the applications of metamaterials in sensing, lasing, and optical devices designing.

On-Chip Fano-Like Resonator With a High Slope and Low-Complexity Fabrication Processing

“…Several Fano-like resonator schemes employing different materials have been proposed, such as plasmon [11], magnetic metamaterial [12],…”

Highly sensitive refractive index sensor for detection of Hg2+ based on Fano-like resonance in metal–dielectric–metal meta-structure

“…The reflectivity is offset. All spectra demonstrate a Fano-like asymmetric lineshape, 15,29) but both the resonant wavelength location and the shape of the dips change slightly. The MR mode is decided by both the thickness of SiO 2 and the size of Au nano-patches, 26) changing the exposure dose of light would result in the size of the Au nano-patches varying, and the MR mode changes and its coupling with FP mode changes, this demonstrates that the Fano-like lineshape in Fig.…”

“…Optical nanostructures are widely used in kinds of sensors, metal-dielectric-metal (MDM) metamaterials are prominent configuration because it has many merits such as localized electromagnetic field (EMF), diversity of optical modes coexisting, simple, cheap, and facile, etc. [13][14][15][16][17][18][19][20][21][22][23][24] Surface plasmon polaritons (SPP) are one of the prominent physical phenomena in metal-dielectric metamaterials, formed through the interaction of photons with electrons at the metal-dielectric interface. In MDM, magnetic dipole resonance (MR) mode forms due to two opposite direction SPP waves formed by one circle current, 13,14) it can strongly localize the EMF in the dielectric.…”

“…Optical modes coupling is facile to manipulate in MDM, and many poverty condensed physical phenomena can be studied and used in the application. [15][16][17][18][19][20][21][22][23][24] Fano resonance phenomena can be facility manipulated through designing the coupling of MR and other modes, for example, propagating SPP, 22) surface lattice resonance (SLR), 16) and phonon, 24) etc. As denoted above, FP and MR can coexist in the dielectric in MDM, they may couple together due to their different spatial EMF distributions, and may be facile in sensing due to their imprecise demand.…”

“…In this work, we study the Fano resonance (FR) due to the coupling between FP and MR in Au-SiO 2 -Au MDM, and its application in mercury detection. Based on our previous works, 15,26,27) we design and manipulate their coupling using FDTD solution software, and then fabricate large-area samples using a stitched soft X-ray interference lithography technique, characterize their morphology using both an optical microscope and scanning electron microscope. Both the FR analysis and its application in mercury trace detection are performed through reflection spectra analysis using home-made UV-vis spectroscopy, which includes one Xenon lamp light source, sample holder, and photomultiplier spectrometer, where both the ingoing and outgoing light are all introduced by fibre, all spectra are detected at room temperature in the wavelength range of 450-900 nm, and an Al film is used as reference.…”