Polarized Raman scattering in strained GaN nanowires

GaN nanowires are important building blocks for next-generation UV-and visible range optoelectronic devices whose performance can be boosted via strain engineering. This necessitates the investigation of physical phenomena in nanowires induced by elastic strains. The present paper studies deformation-induced features of Raman spectrum in individual horizontal GaN nanowire, in which elastic strain was created with AFM probe. Two-dimensional mapping of the Raman signal is carried out with submicron spatial resolution in two polarization configurations. The Raman modes shapes and intensities are analyzed with respect to strain level and polarization of excitation. Deformation potential constants of A(1)(TO) and E2H modes are estimated from strain-induced spectrum broadening.