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The prepared Au nanoingots show a variable cavity structure, powerful plasmon coupling, tunable magnetized plasmon resonance, and prominent photocatalytic and SERS performances. Au nanoingots exhibit two resonance peaks when you look at the extinction spectrum, one (around 550 nm) is ascribed to electric dipole resonance from the central Au, and the other one (650-800 nm) is ascribed to the magnetized dipole resonance originating from the open Au shell. Numerical sim