Abstract
Using pyridine as a probe molecule, we performed surface enhanced Raman spectroscopy (SERS) studies on platinum and gold nanodisk arrays at both plasmon resonant and off-plasmon resonant excitation wavelengths. A large Raman cross-section enhancement factor (EF) of ∼106 was obtained with plasmon resonant excitation on the Au array, and the EF decreases with off-resonant excitations. However, for Pt nanodisks the experimental EF is much smaller (∼102) and not sensitive to excitation wavelength. Electric field intensities calculated in Au and Pt nanoparticles using the discrete dipole approximation (DDA) with a dielectric function including or excluding interband transitions allowed us to explain the SERS EF differences at different excitation wavelengths. The observed SERS insensitivity to excitation wavelength in Pt was explained using Fano interference between the free plasmon electrons and continuum interband transitions. The importance of Fano interference was explored analytically in the electrostatic...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
