Anomalous behavior of nonlinear refractive indexes of CO 2 and Xe in supercritical states

Direct measurement of pressure dependent nonlinear refractive index of CO and Xe in subcritical and supercritical states are reported. In the vicinity of the ridge (or the Widom line), corresponding to the maximum density fluctuations, the nonlinear refractive index reaches a maximum value (up to 4....

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Bibliographic Details
Published in:Optics express 2018-05, Vol.26 (10), p.13229
Main Authors: Mareev, Evgenii, Aleshkevich, Victor, Potemkin, Fedor, Bagratashvili, Victor, Minaev, Nikita, Gordienko, Vyacheslav
Format: Article
Language:English
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Summary:Direct measurement of pressure dependent nonlinear refractive index of CO and Xe in subcritical and supercritical states are reported. In the vicinity of the ridge (or the Widom line), corresponding to the maximum density fluctuations, the nonlinear refractive index reaches a maximum value (up to 4.8*10 m /W in CO and 3.5*10 m /W in Xe). Anomalous behavior of the nonlinear refractive index in the vicinity of a ridge is caused by the cluster formation. That corresponds to the results of our theoretical assumption based on the modified Langevin theory.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.013229