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Group III nitride based two-dimensional multi-quantum well (MQW)nanostructures find remarkable applications in the visible to ultraviolet lightsources. The interface optical (IFO) phonon modes in a c-axis orientedsuperlattice of [Al0.35Ga0.65N (~1.75 nm)/Al0.55Ga0.45N (~2nm)]20 MQWs areobserved using tip-enhanced Raman spectroscopic (TERS) studies. The near-fieldstudies using TERS probe with an Au spherical nanoparticle of ~ 200 nm diameterwere carried out at ambient conditions showing approximately two to threeorders of enhancement in the Raman intensities. The interface phonon modebelonging to E1 symmetry [IFO(E1)] vibrating normal to the c-axis of MQWsappeared to be more prominent in the case of TERS measurement compared to thatfor the other interface phonon mode of A1 symmetry. The confined electric fieldof the polarized electro-magnetic excitation using TERS probe, parallel to theplane of the interface of MQW, is made responsible for the plasmonicenhancement of IFO(E1) phonon mode. The confinement was verified usingfinite-difference time-domain simulation.

Role of polarized tip-enhanced Raman spectroscopy in the enhancement of interface optical phonon modes in AlGaN multi-quantum wells