Three-photon difference-frequency spectroscopy of polaritons in alkali halides

Fröhlich, D.; Kirchhoff, St.; Köhler, P.; Nieswand, W.

doi:10.1103/physrevb.40.1976

Cited by 27 publications

(11 citation statements)

References 15 publications

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“…The accuracy of the fit parameter ET can be improved considerably if resonances on the lower polariton branch are excited. As shown recently by Frohlich et al [7] this is indeed possible by applying three-photon difference-frequency generation (TP-DFG). The authors got resonances with a very small linewidth (0.12 meV) which allowed to resolve the splitting of the lower polariton branch in a magnetic field into two components.…”

Section: Introductionmentioning

confidence: 82%

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Magnetic Field Splitting and Dispersion of the Lower 1S‐Exciton Polariton in KI and RbI

Fröhlich

Kirchhoff

Köhler

et al. 1990

Physica Status Solidi (b)

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Resonances on the lower polariton branch of KI and RbI x e measured by the use of three-photon difference-frequency generation (TP-DFG). From these data the energy of the lowest transverse exciton state is derived. Due to the small linewidth of the resonances it is possible to measure the k-dependent magnetic field splitting of the lower branch for the first time. The results allow to determine the exchange energy, the longitudinal-transverse splitting and the g-values of the uppermost valence band (r, -symmetry) and the lowest conduction band (TZ-symmetry) with much higher accuracy than before.

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Section: Introductionmentioning

confidence: 82%

“…The resonances on the lower polariton branch were measured by TP-DFG as introduced by Frahlich et al [7]. Polaritons are excited inside the crystal by the absorption (t) of two polaritons created by the photons of one of the incoming laser beams and by the emission (1) of a third polariton induced by a second laser beam.…”

Section: Experimental Methods and Setupmentioning

confidence: 99%

Magnetic Field Splitting and Dispersion of the Lower 1S‐Exciton Polariton in KI and RbI

Fröhlich

Kirchhoff

Köhler

et al. 1990

Physica Status Solidi (b)

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“…Though one-photon data clearly show the phenomena of mixed-mode polaritons there are considerable difficulties in the quantitative interpretation of reflectivity data. The first nonlinear investigation of mixed-mode polaritons was done by Frohlich et al With the method of three-photon difference frequency generation (3P-DFG) one can also excite resonances on the lower polariton branch which is very important for the accurate determination of the transverse resonance energy [9]. In this paper we report for the first time a detailed study of the mixed-mode polariton in ZnO by nonlinear optical methods.…”

Section: Introductionmentioning

confidence: 90%

Multiphoton Polariton Spectroscopy on ZnO

Fiebig

Fröhlich

Pahlke-Lerch

1993

Physica Status Solidi (b)

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DiNerent nonlinear techniques are applied to investigate excitonic transitions from the upper valence bands (symmetry I-,, T9, r,) to the lowest conduction band (symmetry r7) in ZnO. Coherent techniques like three-photon difference frequency generation are used for resonances on the lower polariton branch, whereas incoherent techniques are well suited for the investigation on the upper polariton branch. Paraexcitons are detected without external perturbation. The angular dependence of the longitudinal transverse splitting is investigated by excitation of mixed-mode polaritons and analyzed with use of a suitable ansatz for the dielectric tensor in the classical wave equation. The isotropic point at 3.157 CV is studied by non-resonant second harmonic generation. Verschiedene nichtlineare Techniken werden angewandt, urn exzitonische Anregungen von den oberen Valenzbandern (Syrnmetrie r,, T9, r,) in das unterste Leitungsband (Symmetrie r,) in ZnO zu untersuchen. Koharente Techniken wie die Drei-Photonen-Differenzfrequenzerzeugung werden benutzt, urn Resonanzen auf dem unteren Polaritonast anzuregen, wahrend inkohirente Techniken fur Untersuchungen auf den oberen Polaritonasten geeignet sind. Paraexzitonen konnen ohne HuDere Storungen nachgewiesen wcrden. AuDerordentliche Polaritonen werden angeregt. Die Winkelabhlngigkeit der Longitudinal-Transversal LAufspaltung wird bestimmt und anhand eines geeigneten Ansatzes fur den dielektrischen Tensor beschrieben. Der isotrope Punkt bei 3,157 eV wird mit nichtresonanter Erzeugung der zweiten Harmonischen vermessen. ') Otto-Hahn-Str./PSF 500500, W-4600 Dortmund, Federal Republic of Germany.

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“…The exposure time was 3 min. The threads of glue for the strain-free mounting of the sample are clearly seen (magnification: 20) spatially distinguish regions of constructive and destructive interference, which proofs that there is a phase change of the c-tensor between these regions. Since the phase change is due to a spin reversal, these different regions represent different afm domains.…”

Section: Nonlinear Magnetoopticsmentioning

confidence: 87%

“…1). The resonances on the lower polariton branch TP1 can only be obtained by three-photon difference generation as is discussed in detail in [20]. Since most of the resonances of CuCl are very narrow (DE % 0.1 meV) in nonlinear spectroscopy, their splitting in a magnetic field [21], in an electric field [22] and under uniaxial stress [17] can be studied with great accuracy.…”

Section: K-space Spectroscopymentioning

confidence: 99%

Nonlinear Spectroscopy in Semiconductors

Fröhlich¹

1999

phys. stat. sol. (b)

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Three-photon difference-frequency spectroscopy of polaritons in alkali halides

Cited by 27 publications

References 15 publications

Magnetic Field Splitting and Dispersion of the Lower 1S‐Exciton Polariton in KI and RbI

Magnetic Field Splitting and Dispersion of the Lower 1S‐Exciton Polariton in KI and RbI

Multiphoton Polariton Spectroscopy on ZnO

Nonlinear Spectroscopy in Semiconductors

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