Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3291041
Keywords
gallium compounds; III-V semiconductors; II-VI semiconductors; nanoparticles; phonons; silver; surface enhanced Raman scattering; wide band gap semiconductors; zinc compounds
Categories
Funding
- National Science Council [NSC 96-2120-M-001-002]
- Academia Sinica in Taiwan
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The authors report experimental studies of surface-enhanced Raman scattering (SERS) of wurtzite-type GaN and ZnO crystalline samples covered with Ag-nanoparticles. The longitudinal optical phonons consistently exhibit unusually intense Raman enhancement in comparison with other phonons. The anomaly is interpreted by a proposed model based on a resonant Raman scattering process assisted by metal-induced gap states at the Ag/GaN and Ag/ZnO interfaces. This study suggests that SERS of lattice vibrations in inorganic semiconductors is sensitive to their propagation nature, providing a progressive perspective view on electron-mediated enhanced Raman scattering.
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