Femtosecond laser-nanostructured substrates for surface-enhanced Raman scattering.
We present a new type of surface-enhanced Raman scattering (SERS) substrate that exhibits extremely large and uniform cross-section enhancements over a macroscopic (greater than 25 mm2) area. The substrates are fabricated using a femtosecond laser nanostructuring process, followed by thermal deposition of silver. SERS signals from adsorbed molecules show a spatially uniform enhancement factor of approximately 10(7). Spectroscopic characterization of these substrates suggests their potential for use in few or single-molecule Raman spectroscopy.
Diebold
Eric D
ED
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Mack
Nathan H
NH
Doorn
Stephen K
SK
Mazur
Eric
E