Abstract
Light-scattering properties of individual gold-in-Ga 2 O 3 peapod nanowires and gold-in-Ga 2 O 3 core/shell nanowires were investigated by optical dark-field microscopy. The observed scattering peaks are suggested to result from plasmonic resonance of the gold nanopeas and nanorods in the Ga 2 O 3 nanowires. As the diameter of gold peapod increases, the resonance peak of the optical scattering spectra showed a red-shift. In addition, as the gold peas are elongated along one axis, the corresponding plasmon resonance peak splits into two peaks at shorter and longer wavelengths. The cladding Ga 2 O 3 dielectric layer also plays a key role in light-scattering behavior. The observed modulation in the p-polarized spectrum revealed that future vertical nanoplasmonic devices made by plasmonic nanocavity due to the short propagation length of surface plasmons can be realized and optimized. © 2010 American Chemical Society.