The influence of polariton motion on the polariton Raman scattering spectra

Strizhevskiǐ, V. L.; Yashkir, Yu. N.; Ponath, H. E.

doi:10.1002/pssb.2220690243

Cited by 4 publications

(2 citation statements)

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“…Expression (13) coincides with that from [8] if we put what is realized ravely. The reason of the differences is not clear because the formula for A , is presented in [8] without any proof.…”

Section: Specific Physical Features Of the Surface Polariton Rssupporting

confidence: 69%

“…This phenomenon may be called the Fermi resonance of surface polaritons by analogy to the phenomenon of Fermi resonance of molecular vibrations [12] the essence of which consists in the interaction of "strong" and "weak" vibrations of arbitrary order if there is some corresponding perturbation. A distinct peculiarity of the polariton Fermi resonance consists in the fact that the vibration interaction is due to the electromagnetic field (in the given case it is the surface field), and their anharmonicity is not required (compare with the bulk polariton Fermi resonance [13]). Take Fig.…”

Section: Specific Physical Features Of the Surface Polariton Rsmentioning

confidence: 99%

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The theory of Raman scattering by surface polaritons

Strizhevskiǐ¹,

Yashkir²

1975

Physica Status Solidi (b)

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The fluctuation-dissipation theory of spontaneous Raman scattering (RS) by surface polaritons (SP) is carried out. The appearance of scattering emission is treated as the result of mixing of the pump emission and the fluctuating surface electromagnetic field. A calculation is made of the surface electromagnetic fluctuations near the interface between the two dissipative media and in the absorbing layer surrounded by transparent dielectrics. Expressions are found and analysed describing the frequency-angular distribution of the scattering emission intensity in the layer, taking into account the interference of SP localized near different surfaces (and near the interface of two absorbing media). The RS intensities are expressed by the phenomenological parameters of the media. It is also shown that the RS intensity decreases essentially with increasing scattering angle 0 (when the scattering frequency approaches the frequency of the surface phonon) due to the increasing localieation of SP. Various essential physical features of the phenomenon are analysed in detail: scattering line shape and its angular dependence; the B'ermi resonance of SP and its display in the RS; mixing of SP of different media and RS by appearing mixed modes; RS by SP connected genetically with the linear medium which borders with the transparent nonlinear medium; evolution of RS in a layer by decreasing its thickness, and others.

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Section: Specific Physical Features Of the Surface Polariton Rssupporting

confidence: 69%

Section: Specific Physical Features Of the Surface Polariton Rsmentioning

confidence: 99%

The theory of Raman scattering by surface polaritons

Strizhevskiǐ¹,

Yashkir²

1975

Physica Status Solidi (b)

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Theorie der nichtstationären Anregung von Exziton‐Polaritonen durch Zweiphotonenabsorption

Ponath¹

1976

Annalen der Physik

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I n ha1 tsiibersi c ht. Es wird eine Theorie der nichtstationiirenZweiphotonenabsorption, die durch einen ultrakurzen Laserimpuls mit der Dauer TL 5 (T Exzitonenniveau-Linienbreite) und einem inkohkenten Teststrahl angeregt wird, fur nichtlineare Piezokristalle mit einem isolierten dipolaktiven Exzitonenniveau entwickelt. Die .,mechanische" Response der Exzitonen sowie die unterschiedlichen Gruppengeschwindigkeiten von Polaritonen-, Pump-und Testfeldern werden bei der Berechnung der nichtstationiiren Polaritonen-und TestfeldstrahlungsfluDdichten beriicksichtigt, die raumliche Dispersion der mechanischen Exzitonenbewegung jedoch wird vernachliissigt. Am Beispiel des Rechteckimpulses fur das Pumpfeld werden die allgemeinen nichtstationiiren analytischen Losungen fur die Fiille gleicher und verschiedener Pump-und Testfeld-Gruppengeschwindigkeiten diskutiert. An Hand der Energie-und Quasiimpulserhaltungbsltze und mit den Dispersidnsbeziehungen werden fiir einachsige Kristalle die verschiedenen moglichen Zweiphotonenabsorptionsvarianten veranschaulicht.A b s t r a c t . A theory of nonstationary two-photon absorption for nonlinear non-centrosymmetric crystals is presented. The time-dependent radiation flux density of the generated polariton beam is calculated under the condition of an ultrashort laser pulse duration TL 5 P' (1" is the exciton line width) and a stationary incoherent test field. The "mechanical" response of the excitons and different group velocities of the polariton and the laser and test fields are taken into account, the spatial dispersion of the exciton motion being neglected. With a rectangular laser pulse shape the analytically nonstationary solutions are discussed for identical and for different group velocities of laser and test fields. Using the conservation laws for energy and quasimomentum we illustrate, by considering the polariton dispersion branches, the various possible cases of two-photon absprption in uiiiaxial piezocrystals. EinleitungDie in den Arbeiten [ 1-41 entwickelten und init Experimenten belegten stationaren

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Phase matching for difference frequency generation in the view of spontaneous Raman scattering by hot polaritons

Wagner¹,

Claus²

1981

Phys. Stat. Sol. (a)

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Difference frequency generation between the radiation of a CO2, laser in the infrared and a Kr+ laser in the visible is studied on the materials LiNbO2, and Gap. Both the lasers are used in the continuously working mode. The results are discussed in the well known view of non‐linear optics where phase matching is related with a coherence length and in the picture of spontaneous light scattering by “hot polaritons”. The phase mismatch Δk in the latter case follows directly from a simultaneous solution of the polariton dispersion relation and momentum conservation for spontaneous light scattering. This provides a convenient graphical interpretation of Δk in the ω, k diagram which is of advantage in spectral regions with dispersion.

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The influence of polariton motion on the polariton Raman scattering spectra

Cited by 4 publications

References 4 publications

The theory of Raman scattering by surface polaritons

The theory of Raman scattering by surface polaritons

Theorie der nichtstationären Anregung von Exziton‐Polaritonen durch Zweiphotonenabsorption

Phase matching for difference frequency generation in the view of spontaneous Raman scattering by hot polaritons

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