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Near-forward Raman study of a phonon-polariton reinforcement regime in the Zn(Se,S) alloy

Abstract : We investigate by near-forward Raman scattering a presumed reinforcement of the (A-C,B-C)-mixed phonon-polariton of a A(1-x)B(x)C zincblende alloy when entering its longitudinal optical-like (LO-like) regime near the Brillouin zone centre Gamma, as predicted within the formalism of the linear dielectric response. A choice system to address such issue is ZnSe0.68S0.32 due to the moderate dispersion of its refractive index in the visible range, a sine qua non condition to bring the phonon-polariton insight near Gamma. The LO-like reinforcement regime is actually accessed by using the 633.0 nm laser excitation, testified by the strong emergence of the (Zn-Se,Zn-S)-mixed phonon-polariton at ultimately small scattering angles.
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R. Hajj Hussein, O. Pagès, F. Firszt, A. Marasek, W. Paszkowicz, et al.. Near-forward Raman study of a phonon-polariton reinforcement regime in the Zn(Se,S) alloy. Journal of Applied Physics, American Institute of Physics, 2014, 116 (8), ⟨10.1063/1.4893322⟩. ⟨hal-01516065⟩

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