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This paper demonstrates an arbitrary tunable spaser based on double-Fanoresonance of a plasmonic nanostructure consisting of two sets of disk-ring(TSDR) nanostructure. TSDR nanostructure supports two Fano resonances, whichcan be served as the lasing mode and the pumping mode of a spaser. These twomode can be tuned in a very wide wavelength range because of the goodtunability of the two nanorings. The tuning range of the lasing mode and thepumping mode can be reached to 710 nm and 620 nm. These results represent asignificant step in the pursuit of ultimate spasers and propose a approach tomanipulate lasing mode and pumping mode over a broad spectral range.

Arbitrary tunable spaser based on double-Fano resonance of two sets of disk-ring nanostructure