Polarized and diameter-dependent Raman scattering from individual aluminum nitride nanowires: The antenna and cavity effects

Hsu Cheng Hsu, Geng Ming Hsu, Yu Shiung Lai, Zhe Chuan Feng, Shuo Yen Tseng, Anders Lundskog, Urban Forsberg, Erik Janzén, Kuei Hsien Chen, Li Chyong Chen

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

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, ∼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.

Original languageEnglish
Article number121902
JournalApplied Physics Letters
Volume101
Issue number12
DOIs
Publication statusPublished - 2012 Sep 17

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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