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A high-performance wide-angle refractive index sensor based on a simpleonedimensional (1D) metallic deep nanogroove array with high aspect ratio isexperimentally fabricated and demonstrated. The 1D deep groove array isfeatured by the excitation of magnetic plasmon (MP), referring to an effectivecoupling of incident electromagnetic waves with a strong magnetic responseinduced inside the deep grooves. Utilizing the MP resonances that are extremelysensitive to the surrounding dielectric medium, we successfully achieve arefractive index sensitivity (RIS) up to $\sim$1300 nm/RIU, which is higherthan that of most experimentally designed plasmonic sensors in infrared region.Importantly, benefiting from angle-independent MP resonances with strongconfinement of magnetic field inside the deep grooves and strong electric fieldlocalization at the groove openings, we demonstrate wide-angle sensingcapability valid in a broadband infrared region with an excellent lineardependence on the change of refractive index. Such a MP-based sensor, togetherwith its simple 1D flat nature and ease of fabrication, has great potential forpractical design of high sensitive, cost-effective and compact sensing devices.

Experimental demonstration of high sensitivity refractive index sensing based on magnetic plasmons in a simple metallic deep nanogroove array