Shape-Dependent Effect of Surface-Enhanced Raman Scattering on Gold Nanostructure Arrays

摘要

Surface-enhanced Raman scattering (SERS) on gold nanohole and nanodisk arrays with precisely controlled size, spacing and shapes of rod, and circle fabricated via focused ion beam was investigated by 632- and 785-nm lasers. Results demonstrate that nanodisks and nanoholes exhibit strong SERS signals at 632-nm excitation, but only rod nanoholes present SERS signals at 785-nm excitation. The normal incidence transmission spectrum of nanoholes shows the extension of near-infrared wavelength, but not for nanodisks. The broadband wavelength of plasmon resonance and space confined by rod nanoholes suggest promise for being a functional component in biosensing, Raman spectroscopy, and photonic devices.