Optically confined polarized resonance Raman studies in identifying crystalline orientation of sub-diffraction limited AlGaN nanostructure

Abstract

An optical characterization tool of Raman spectroscopy with extremely weak scattering cross section tool is not popular to analyze scattered signal from a single nanostructure in the sub-diffraction regime. In this regard, plasmonic assisted characterization tools are only relevant in spectroscopic studies of nanoscale object in the sub-diffraction limit. We have reported polarized resonance Raman spectroscopic (RRS) studies with strong electron-phonon coupling to understand the crystalline orientation of a single AlGaN nanowire of diameter about 100 nm. AlGaN nanowire is grown by chemical vapor deposition technique using the catalyst assisted vapor-liquid-solid process. The results are compared with the high resolution transmission electron microscopic analysis. As a matter of fact, optical confinement effect due to the dielectric contrast of nanowire with respect to that of surrounding media assisted with electron-phonon coupling of RRS are useful for the spectroscopic analysis in the sub-diffraction limit of 325 nm (lamda(2N.A.)^(-1)) using an excitation wavelength (lamda) of 325 nm and near ultraviolet 40X far field objective with a numerical aperture (N.A.) value of 0.50.

arXiv comment13 pages, 4 figures, journal. arXiv admin note: text overlap with arXiv:1509.00193

References in corpus (3)

• Directed sub-wavelength imaging using a layered metal-dielectric system
• Multi-phonon Raman scattering in GaN nanowires
• Influence of oxygen in architecting large scale nonpolar GaN nanowires

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• Interface Phonon Modes in the [AlN/GaN]20 and [Al0.35Ga0.65N/Al0.55Ga0.45N]20 2D Multi Quantum Well Structures