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Optical excitation of metallic nanostructures induces strong intraband transitions, leaving transient depletion below the Fermi level, which allows transient interband transition to this depletion band. This is equivalent to the lowering of the threshold for interband transitions and pushes the plasmonic band to the red. As a result, localized surface plasmon resonance (LSPR) is "extinguished" or "quenched" around the bandedge, in contrast, the interband optical absorption becomes enhanced anddoi:10.1515/nanoph-2020-0603 fatcat:vau7rlqy3jbzrbmdocs4ggxjpy