The effect of pressure on the polariton modes in the superlattices is analyzed.īy assuming the electromagnetic boundary conditions, several author like Nkoma, Navaneethakrishnan etc have drived dispersion relation of phonon Polariton in various forms of superlattices for TM modes. Hence the phonon polariton modes of LD systems such as (QWSL), (QWWSL) and (QDOTSL) are studied. The behavior of the phonon polariton modes in GaAS/AlAs superlattice is discussed. In this work, the variation of optical parameters such as dielectric constant and optical phonon frequencies with pressure are analysed for the bulk GaAS and AlAs materials. The polaritons in quantum dot superlattices (QDOTSL) have been investigated by Joseph Wilson and Navaneethakrishnan. The polariton dispersions in low dimensional systems such as quantum well (QWSL) and quantum wire superlattice (QWWSL) are investigated. One can distribute polariton in different types: phonon polariton, exciton polariton and plasmon Polariton etc. Polariton can be simply defined as the strong coupling of photon with another quasiparticle. Furthermore, Raman measurements of the confined optical phonons in the SLS can be used to determine the phonon dispersion in the bulk material. Raman scattering involves the coupling of light to phonons via the electronic system. Raman spectroscopic studies of low dimensional semiconductors can provide detailed information on their crystal structure, phonon dispersion, electronic states, lattice strain, composition etc, , ]. Modern low dimensional systems have demonstrated many novel quantum phenomena and are postulated to be the next step of evolution of electronics. Restricting the dimensionality of the system called low dimensional system has led to many advances in modern electronics and is one of the keys to unlocking access to quantum phenomena. Phonons in semiconductor superlattices (SLs) composed of alternate layers of two different semiconductors have a number of novel features as compared to those in the corresponding bulk semiconductors.
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