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

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...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (17)
Main Authors: Sivadasan, A. K., Patsha, Avinash, Dhara, Sandip
Format: Article
Language:English
Subjects:
Applied physics
CATALYSTS
CHEMICAL VAPOR DEPOSITION
COMPARATIVE EVALUATIONS
CONFINEMENT
Coupling
Crystal structure
Crystallinity
DIELECTRIC MATERIALS
DIFFRACTION
ELECTRON-PHONON COUPLING
EXCITATION
LIQUIDS
Microscopes
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructure
NANOSTRUCTURES
Nanowires
Numerical aperture
Optical properties
Organic chemistry
ORIENTATION
RAMAN SPECTROSCOPY
RESONANCE
Scattering cross sections
SOLIDS
Spectroscopic analysis
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET RADIATION
VAPORS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 ∼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 is useful for the spectroscopic analysis in the sub-diffraction limit of 325 nm (λ/2N.A.) using an excitation wavelength (λ) of 325 nm and near ultraviolet 40× far field objective with a numerical aperture (N.A.) value of 0.50.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4919535