Influence of Gold Nanorod Geometry on Optical Response

TitleInfluence of Gold Nanorod Geometry on Optical Response
Publication TypeJournal Article
Year of Publication2010
AuthorsStender AS, Wang GF, Sun W, Fang N
Journal TitleACS Nano
Date Published12
ISBN Number1936-0851
Accession NumberISI:000285449100079
Keywordsaspect ratio, dark field microscopy, differential interference contrast (dic) microscopy, diffraction limit, dim, gold nanorod, interference-contrast microscopy, multipole, nanoparticle pairs, plasmonic nanoparticle, single gold, surface plasmon resonance

As noble metal nanoparticles are deployed into increasingly sophisticated environments, it is necessary to fully develop our understanding of nanoparticle behavior and the corresponding instrument responses. In this paper, we report on the optical response of three important gold nanorod configurations under dark field and differential interference contrast (DIC) microscopy after first establishing their absolute geometries with transmission electron microscopy (TEM). The observed longitudinal plasmon wavelengths of single nanorods are located at wavelengths consistent with previously developed theory. A dimer is shown exhibiting a multipole plasmon at wavelengths that are consistent with the dipole plasmon of single nanorods in the sample. DIC can also distinguish a single nanorod from a pair of uncoupled nanorods with an interparticle distance below the diffraction limit. The experimental observations are consistent with simulated DIC images using a DIC point spread function. The findings herein are a critical step toward being able to characterize nanorods in dynamic environments without the use of electron microscopy.

URL<Go to ISI>://000285449100079
Alternate JournalAcs Nano