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We demonstrate surface plasmon-induced enhancements in optical imaging andspectroscopy on silver coated silicon nanocones which we call black silversubstrate. The black silver substrate with dense and homogeneous nanoconeforest structure is fabricated on wafer level with a mass produciblenanomanufacturing method. The black silver substrate is able to efficientlytrap and convert incident photons into localized plasmons in a broad wavelengthrange, which permits the enhancement in optical absorption from UV to NIR rangeby 12 times, the visible fluorescence enhancement of ~30 times and the NIRRaman scattering enhancement factor up to ~108. We show a considerablepotential of the black silver substrate in high sensitivity and broadbandoptical sensing and imaging of chemical and biological molecules.

Surface plasmon enhanced broadband spectrophotometry on black silver substrates