Theoretical Simulation and Focused Ion Beam Fabrication of Gold Nanostructures for Surface-Enhanced Raman Scattering (SERS)
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This paper describes the fabrication of gold nanopillar and nanorod arrays and theoretical calculations of electromagnetic fields (EMFs) around ordered arrangements of these nanostructures. The EMFs of both single nanopillars and dimers of nanopillars—having nanoscale gaps between the two adjacent nanopillars forming the dimers—are simulated in this work by employing the finite-difference time-domain method. In the case of simulations for dimers of nanopillars, the nanoscale gaps between the nanopillars are varied between 5 and 20 nm, and calculations of the electromagnetic fields in the vicinity of the nanopillars and in the gaps between the nanopillars were carried out. Fabrication of gold nanopillars in a controlled manner for forming SERS substrates involves focused ion beam (FIB) milling. The nanostructures were fabricated on gold-coated silica, mica, and quartz planar substrates as well as on gold-coated tips of four mode and multimode silica optical fibers.
KeywordsSERS FIB LSPR EMF FDTD
This work was sponsored by the US Army Research Office, National Research Council, and the National Institutes of Health (Grants R01 EB006201 and R01 ES014774).
- 4.Gerhold MD, Dhawan A, Muth JF. In-line fiber sensors for environmental sensing. Proc. Intl. Sym. For Spectral Sensing Research. 2006.Google Scholar
- 11.Raether H. Surface plasmons on smooth and rough surfaces and on gratings. Berlin: Springer; 1988.Google Scholar