Microphotoluminescence study of exciton polaritons guided in ZnO nanorods

Li, Wenliang; Gao, Min; Zhang, Xiaoxian; Liu, Dongfang; Peng, Lian-Mao; Xie, Sishen
October 2009
Applied Physics Letters;10/26/2009, Vol. 95 Issue 17, p173109
Academic Journal
By confocal microphotoluminescence spectroscopy, we study the influence of the localized excitation position on the guided near band edge emission from the end facets of ZnO nanorods. An increased propagation distance of the guided emission causes dramatically depressed excitonic emission and pronounced blueshifts of the Fabry–Pérot cavity modes. The blueshifts can be understood on the basis of enhanced inelastic processes of the exciton polaritons guided in the nanorod cavities and reduced oscillator strength. The blueshifts exhibit local maxima at LO phonon-related emissions, emphasizing the role of the LO phonons in the relaxation and inelastic scattering of the exciton polaritons.


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