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 1012M and the Raman enhancement factor as large as 109. 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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