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Reflectance, excitation, and luminescence spectra at energies near the $1s$ excitonic resonance of a thin (500 nm) GaAs-AlGaAs double heterostructure are reported. The reflectance data are analyzed by using a dielectric model. Excitation as well as luminescence spectra reveal the properties of discrete polariton states due to quantization.
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Schultheis et al. (1984) studied this question.
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