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Polarized and diameter-dependent Raman scattering from individual aluminum nitride nanowires: The antenna and cavity effects
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- Hsu, Hsu-Cheng (author)
- National Cheng Kung University, Taiwan National Cheng Kung University, Taiwan
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- Hsu, Geng-Ming (author)
- National Taiwan University, Taiwan
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- Lai, Yu-shiung (author)
- National Taiwan University, Taiwan
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- (creator_code:org_t)
- American Institute of Physics (AIP), 2012
- 2012
- English.
- In: Applied Physics Letters. - : American Institute of Physics (AIP). - 0003-6951 .- 1077-3118. ; 101:12, s. 121902-
- Journal article (peer-reviewed)
Abstract
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- Raman scattering of individual aluminum nitride (AlN) nanowires is investigated systematically. The axial direction of single nanowire can be rapidly verified by polarized Raman scattering. The angular dependencies of E-2(high) mode show strongly anisotropic behavior in smaller nanowires, which results from optical antenna effect. Raman enhancement (RE) per unit volume of E-2(high) increases with decreasing diameter of nanowires. Compared to the thin film, similar to 200-fold increase of RE is observed in AlN nanowires having diameter less than 50 nm, which is far beyond the quantum confinement regime. Such a large RE can be attributed to the effects of resonant cavity and stimulated Raman scattering.
Keyword
- TECHNOLOGY
- TEKNIKVETENSKAP
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- ref (subject category)
- art (subject category)
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- Hsu, Hsu-Cheng
- Hsu, Geng-Ming
- Lai, Yu-shiung
- Chuan Feng, Zhe
- Tseng, Shuo-Yen
- Lundskog, Anders
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- Forsberg, Urban
- Janzén, Erik
- Chen, Kuei-Hsien
- Chen, Li-Chyong
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- Linköping University
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