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£¨ÎÄÏ×Ô­ÎÄ£ºThe wavelength of the excitation laser was 676 nm, which is slightly far from the plasmon resonance wavelength of 550 nm for 50 nm gold nanoparticle. Even at this wavelength gold nanoparticles give high SERS signals, as shown later, due to the contribution of the interband transition of gold atoms to dielectric function of gold.The experimental results with the excitation laser at around 550 nm were dominated by the photoluminescence from the gold nanoparticle due to the plasmon resonance, which hindered the Raman signal from
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