Milekhin, A.G.A.G.MilekhinRösch, M.M.RöschBatke, E.E.BatkeZahn, D.R.T.D.R.T.ZahnKöhler, KlausKlausKöhlerGanser, P.P.GanserPreobrazhenskij, V.V.PreobrazhenskijSemyagin, B.B.Semyagin2022-03-032022-03-031999https://publica.fraunhofer.de/handle/publica/194672The optical phonon modes in short-period GaAs/AlAs superlattices were investigated by means of Raman spectroscopy and far-infrared reflection spectroscopy using a grating coupler technique. Grating couplers provide a wave vector transfer parallel to the layers, enabling study of in-plane dispersion of the phonon modes in the superlattice structure. The mixing of confined and interface optical modes was observed as the in-plane phonon wave vector was varied. The experimental frequencies of the superlattice optical modes obtained from infrared and Raman spectra are in good agreement with calculations performed using a dielectric continuum model.enIII-V HalbleiterIII-V semiconductorintegrated circuitsintegrierter SchaltkreisQuantenfilmquantum wells621667journal article