Observation of Fabry-Pérot modes in the upper branch of the polariton in ZnSe-GaAs epilayers

Boemare, C.; Gil, Bernard; Assunção, M.; Söllner, J.; Taudt, W.; Heuken, M.; Nazaré, Maria Helena

doi:10.1103/physrevb.51.7954

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…We also notice that these values are especially remarkable when compared to standard III-V semiconductor heterostructures, in which radiationmatter coupling energy is typically measured in the order of few meV while the coupling strength is in the order of 200 meV in our case. In particular, the present experiments correspond in spirit to early investigations on the optical response of thin films in III-V semiconductors with strong excitonic absorption [37][38][39] , where excitonpolariton effects were first evidenced even in the absence of bottom and top mirrors. Finally, we take advantage of the surface homogeneity of these monocrystalline slabs to illustrate optical propagation for distances of tens of microns without being scattered by defects (see Figure 4a and Figure 12 in the Appendix).…”

Section: Resultssupporting

confidence: 84%

Tunable Out-of-Plane Excitons in 2D Single-Crystal Perovskites

et al. 2018

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Hybrid organic-inorganic perovskites have emerged as very promising materials for photonic applications, thanks to the great synthetic versatility that allows to tune their optical properties. In the two-dimensional (2D) crystalline form, these materials behave as multiple quantum-well heterostructures with stable excitonic resonances up to room temperature. In this work strong lightmatter coupling in 2D perovskite single-crystal flakes is observed, and the polarization-dependent exciton-polariton response is used to disclose new excitonic features. For the first time, an outof-plane component of the excitons is observed, unexpected for such 2D systems and completely absent in other layered materials, such as transition-metal dichalcogenides. By comparing different hybrid perovskites with the same inorganic layer but different organic interlayers, it is shown how the nature of the organic ligands controllably affects the out-of-plane exciton-photon coupling. Such vertical dipole coupling is particularly sought in those systems, e.g. plasmonic nanocavities, in which the direction of the field is usually orthogonal to the material sheet. Organic interlayers are shown to affect also the strong birefringence associated to the layered structure, which is exploited in this work to completely rotate the linear polarization degree in only few microns of propagation, akin to what happens in metamaterials.

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Section: Resultssupporting

confidence: 84%

Tunable Out-of-Plane Excitons in 2D Single-Crystal Perovskites

et al. 2018

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“…In such confined Fabry-Perot-like structures interference of propagating and counterpropagating polaritons occurs what gives rise to a quantization of the polariton wave vector. This quantization manifests itself by oscillatory structures in luminescence, reflection, and transmission spectra which have been observed in various semiconductors like CdS [6], CdTe [7], GaAs [8 to 111, ZnSe [12,131, and, very recently, in epitaxially grown CuCl layers [14].…”

Section: Introductionmentioning

confidence: 99%

Propagation of femtosecond pulses in thin ZnSe layers

Neukirch

Wundke

Gutowski

et al. 1996

Physica Status Solidi (b)

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The transmission of optical femtosecond pulses through ZnSe/ZnS,Sel-, heterostructures is investigated in both the spectral and the temporal domain. Quantization of the polariton wave vector within the thin ZnSe layers (23 to 100 nm) leads to a variety of allowed propagating modes which are clearly resolved in transmission spectra. Interference of all contributing modes gives rise to a very pronounced and complex temporal beating behavior of the transmitted pulses measured with femtosecond resolution. The transmission spectra as well as the transients taken from different samples are consistently described by a model based on three-oscillator polariton theory using Pekar's additional boundary conditions.

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“…[3][4][5][6][7][8][9][10] As compared to the PL spectra, the reflectance spectra of the exciton-polaritons in ZnSe/GaAs heterostructures were less investigated and the spectra are more complicated. [11][12][13][14][15] The existence of the exciton ''dead layer'' and the additional boundary conditions imposed on the polarization field near the sample surface can induce spike-like features. 11,16 -18 The interference of the polaritons scattered from different interfaces and surface can result in standing waves and alert the spectra dramatically.…”

Section: Introductionmentioning

confidence: 99%

“…14 The contributions of the nearly degenerate heavy-hole ͑hh͒ and light-hole ͑lh͒ excitons and their excited states make the spectra even more difficult to interpret without a detailed spectral analysis. 12,13 In spite of these complications, optical reflection remains as one of the most powerful techniques in the investigation of excitonpolaritons in semiconductor heterostructures.…”

Section: Introductionmentioning

confidence: 99%

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Thickness dependence of exciton and polariton spectra from ZnSe films grown on GaAs substrates

Wang

Huang

Sheng

et al. 2001

Journal of Applied Physics

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of in-plane strain anisotropy in ZnSe(001)/GaAs layers using reflectance difference spectroscopy J.ZnSe films with thicknesses from 0.05 to 1.45 m were grown on GaAs substrates by molecular beam epitaxy. Low temperature photoluminescence ͑PL͒ and reflectance spectra are presented to show the thickness dependence of the exciton and polariton properties in the films. In addition to sharp PL peaks from free and donor bound excitons, an acceptor bound exciton peak was observed in the thin films and its intensity decreases rapidly with the film thickness. The PL characteristics show the acceptor centers being the defect states near the ZnSe/GaAs interface. The classical theory of exciton-polaritons was used to calculate the reflectance spectra and compared to the measured results. The comparison reveals the effects of strain, surface, and interface on the reflectance spectra from both heavy-and light-hole excitons. In addition to the strain-induced light-and heavy-hole splitting, the light-hole excitons show a larger damping and less sensitivity to the surface dead layer than the heavy-hole excitons. When the film thickness increases, the interference effects become more important and the contribution from the excited exciton states to the reflectance spectra may no longer be negligible.

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Observation of Fabry-Pérot modes in the upper branch of the polariton in ZnSe-GaAs epilayers

Cited by 11 publications

References 10 publications

Tunable Out-of-Plane Excitons in 2D Single-Crystal Perovskites

Tunable Out-of-Plane Excitons in 2D Single-Crystal Perovskites

Propagation of femtosecond pulses in thin ZnSe layers

Thickness dependence of exciton and polariton spectra from ZnSe films grown on GaAs substrates

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