TY - GEN
T1 - The effect of surface roughness on the extinction spectra and electromagnetic fields around gold nanoparticles
AU - Li, Shuzhou
AU - Schatz, George C.
PY - 2008
Y1 - 2008
N2 - Electromagnetic enhancement arising from plasmon resonance excitation plays a major role in surface-enhanced Raman spectroscopy (SERS), and as a result nanoparticle morphology can significantly affect SERS intensities. In this paper we have calculated these enhancements as well as extinction spectra using the discrete dipole approximation for a system consisting of a dimer of gold disks that is made using on-wire lithography. Including surface roughness in the calculations leads to SERS enhancements for the disks whose dependence on disk spacing and thickness is in agreement with experimental measurements, with a maximum enhancement when the thickness of the disk and the disk-disk gap are 100 nm and 32 nm, respectively. These results are in better agreement with experiments than earlier estimates based on flat surfaces.
AB - Electromagnetic enhancement arising from plasmon resonance excitation plays a major role in surface-enhanced Raman spectroscopy (SERS), and as a result nanoparticle morphology can significantly affect SERS intensities. In this paper we have calculated these enhancements as well as extinction spectra using the discrete dipole approximation for a system consisting of a dimer of gold disks that is made using on-wire lithography. Including surface roughness in the calculations leads to SERS enhancements for the disks whose dependence on disk spacing and thickness is in agreement with experimental measurements, with a maximum enhancement when the thickness of the disk and the disk-disk gap are 100 nm and 32 nm, respectively. These results are in better agreement with experiments than earlier estimates based on flat surfaces.
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U2 - 10.1557/proc-1087-v01-08
DO - 10.1557/proc-1087-v01-08
M3 - Conference contribution
AN - SCOPUS:70449638264
SN - 9781605608747
T3 - Materials Research Society Symposium Proceedings
SP - 13
EP - 16
BT - Materials Research Society Symposium Proceedings - Crystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation
PB - Materials Research Society
T2 - Crystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation
Y2 - 24 March 2008 through 28 March 2008
ER -