Abstract
We report a simple and repeatable method for fabricating a large-area substrate for surface-enhanced Raman scattering. The substrate was processed by three steps: (i) femtosecond (fs) laser micromachining and roughening, (ii) thin-film coating, and (iii) nanosecond laser heating and melting. Numerous gold nanoparticles of various sizes were created on the surface of the silicon substrate. The 3D micro-/nanostructures generated by the fs laser provide greater surface areas with more nanoparticles leading to 2 orders of magnitude higher of the enhancement factor than in the case of a flat substrate. Using an He-Ne laser with a 632.8nm excitation wavelength, the surfaceenhanced Raman scattering enhancement factor for Rhodamine 6G was measured up to 2 × 107.
Original language | English (US) |
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Pages (from-to) | 3353-3355 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 36 |
Issue number | 17 |
DOIs | |
State | Published - Sep 1 2011 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics