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Calculated average excitation enhancement within 10 nm layer above the surface for substrates with variation of silica cavity layer for selected incident wavelengths: (1) 470, (2) 530, (3) 630, (4) 680, and (5) 780 nm). (a) Substrate with mirror, silica layer, and AgNP array, (b) substrate with silica layer and AgNP array, and (c) substrate with mirror and silica layer.
