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Novel dual-scale structures were obtained by femtosecond double pulse train (subpulse delay Δt>0ps) one-step irradiating silicon in water. The dual-scale structures consist of microspikes of ∼2μm width and ∼0.5μm height, and nanoripples with a mean period of 146nm or nanoparticles with a mean diameter of 90nm which entirely cover on the microspikes, for linearly polarized or circularly polarized...
This study proposed a fast, simple, eco-friendly method for obtaining highly sensitive and uniform surface-enhanced Raman scattering (SERS) of silver (Ag) nanotextured substrates decorated with silver nanoparticles in open air. By splitting conventional femtosecond pulses (subpulse delay Δt = 0 ps) into pulse trains (subpulse delay Δt = 3 ps), the mean diameter of Ag nanoparticles was reduced by almost...
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