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Surface enhanced Raman scattering of light by ZnO nanostructures |
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| Authors: | A. G. Milekhin N. A. Yeryukov L. L. Sveshnikova T. A. Duda E. I. Zenkevich S. S. Kosolobov A. V. Latyshev C. Himcinski N. V. Surovtsev S. V. Adichtchev Zhe Chuan Feng Chia Cheng Wu Dong Sing Wuu D. R. T. Zahn |
| Affiliation: | 1. Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrentieva 13, Novosibirsk, 630090, Russia 2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia 3. Belarussian National Technical University, pr. Nezavisimosti 65, Minsk, 220072, Belarus 4. Institut für Theoretische Physik, Technische Universit?t Bergakademie Freiberg, Gellert-Bau, Leipziger Str. 23, Freiberg, 09596, Germany 5. Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk, 630090, Russia 6. Graduate Institute of Photonics and Optoelectronics, National Taiwan University, 1 Roosevelt Rd. Sec. 4, Taipei, 106, Taiwan, R.O.C. 7. Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, 40227, Taiwan R.O.C. 8. Institute of Physics, Semiconductor Physics, Chemnitz University of Technology, Reichenhainer Str. 70, Neues Physikgeb?ude (NPhG, Raum P150, Chemnitz, 09107, Germany |
| Abstract: | Raman scattering (including nonresonant, resonant, and surface enhanced scattering) of light by optical and surface phonons of ZnO nanocrystals and nanorods has been investigated. It has been found that the nonresonant and resonant Raman scattering spectra of the nanostructures exhibit typical vibrational modes, E 2(high) and A 1(LO), respectively, which are allowed by the selection rules. The deposition of silver nanoclusters on the surface of nanostructures leads either to an abrupt increase in the intensity (by a factor of 103) of Raman scattering of light by surface optical phonons or to the appearance of new surface modes, which indicates the observation of the phenomenon of surface enhanced Raman light scattering. It has been demonstrated that the frequencies of surface optical phonon modes of the studied nanostructures are in good agreement with the theoretical values obtained from calculations performed within the effective dielectric function model. |
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