Abstract
The reflection and transmission spectra have been measured for thin NaI, KI, RbI and CsI single crystals with 0.1∼0.3 µm thickness at 11 K. Pronounced structures due to the Fabry-Perot interference are observed in the vicinity of the exciton resonance, showing a strong dispersion of the refractive index. By fitting the obtained results with the theoretical dispersion formula we determine the background dielectric constant, the transverse exciton energy and the longitudinal-transverse (L-T) splitting for each iodide. The present values of L-T splitting are compared with the ones determined from different experiments or calculated independently from the oscillator strength of excitons. On the basis of these experimental values, the validity of the polariton concept in alkali iodide crystals is discussed.
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