Raman mapping probing of tip-induced anomalous polarization behavior in V2O5 waveguiding nanoribbons

Bin Yan; Chaoling Du; Lei Liao; Yumeng You; Hao Cheng; Zexiang Shen; Ting Yu
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p073105
Academic Journal
Spatially resolved and polarized micro-Raman spectroscopy has been performed on individual V2O5 waveguiding nanoribbons. The experimental results establish that the Raman-antenna patterns are strongly correlated with the local positions of the sample, which gives rise to a pronounced intensity contrast in the polarized mapping for certain phonon modes. The suppressed phonon signals at the body of a ribbon can be enhanced at the end facets, resulting from the effective waveguiding propagation along the nanoribbon and strong local electric field intensity at the ends. The phenomena reported here, in addition to providing insight into the tip effects on optoelectronic nanodevices, will facilitate the rational design of Raman detection in nanostructures.


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