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Plasmon Resonance Spectroscopy of Gold-in-Gallium Oxide Peapod and Core/Shell Nanowires

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journal contribution
posted on 23.03.2010, 00:00 by Yi-Jen Wu, Chin-Hua Hsieh, Po-Ham Chen, Jing-Yang Li, Li-Jen Chou, Lih-Juann Chen
Light-scattering properties of individual gold-in-Ga2O3 peapod nanowires and gold-in-Ga2O3 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 Ga2O3 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 Ga2O3 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.