In this work, using the maskless lithography technique, we have fabricated a series of square Ag/SiN/Ag magnetic absorbers with different side lengths. Multiple absorption peaks occur and are analyzed with the help of their field distribution simulation. The absorption peaks coming from the first and third magnetic resonance modes can be arbitrarily modulated by changing the side lengths. The magnetic absorbers exhibit strong absorption, polarization selectivity and arbitrary adjustability. Absorption peaks dominated by the first magnetic resonance modes possess high polarization selectivity, whereas absorption peaks dominated by the phonons of SiN are polarization-insensitive. Such magnetic metamaterials would advance laser techniques and optical device applications.

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.

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