title: Femtosecond and nanosecond laser fabricated substrate for surface-enhanced Raman scattering.
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 632.8 nm excitation wavelength, the surface-enhanced Raman scattering enhancement factor for Rhodamine 6G was measured up to 2×10(7).
authors: Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
authors: Adam
authors: A
authors: Hamdorf
authors: Matthew
authors: M
authors: Olson
authors: Cheng-Hsiang
authors: CH
authors: Lin
authors: Lan
authors: L
authors: Jiang
authors: Jun
authors: J
authors: Zhou
authors: Hai
authors: H
authors: Xiao
authors: Hai-Lung
authors: HL
authors: Tsai