Abstract
High-density ZnO nanocombs were first grown on a nanoporous silicon pillar array, and pre-prepared 3D Si/ZnO/Ag nanocomb arrays were employed as substrates for surface-enhanced Raman scattering (SERS). The finite-difference time-domain simulation result shows that two kinds of inter-Ag–NP nanogaps in the geometry create a large number of SERS “hot spots,” which contributes to the detection limits for rhodamine–6G as low as and the Raman enhancement factor as large as . The linear dependence between the Raman peak intensities and the concentrations of thiram provides a new calibration method for rapid and quantitative detection of trace organic molecules.
© 2014 Optical Society of America
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