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Non-linear Optical Response as a Food Authentication: Investigation of Non-linear Optical Properties of Edible Oils by Spatial Self-Phase Modulation (SSPM) Method

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Abstract

The non-linear optical responses of cherry seed oil, avocado seed oil, and sesame oil were investigated by observing spatial self-phase modulation (SSPM) in oil samples using a continuous wave laser beam. The non-linear refraction coefficients and third-order non-linear susceptibility χ(3) of the edible oils were estimated to be 10−6 cm2/W and 10−5 esu, respectively, based on the intensity-dependent number of symmetric diffraction rings observed. Additionally, we examined the potential of the spatial self-phase modulation technique to determine the authenticity of three adulterated oils based on their non-linear optical properties. For this purpose, five different adulterated samples were prepared by diluting the samples with sunflower oil, a cheaper commercial oil, at various dilution ratios. The measured non-linear optical parameters of the adulterated samples revealed a strong correlation between the non-linear optical properties and the level of adulteration in the samples. These results suggest that the SSPM technique could be considered for estimating the degree of adulteration in samples based on their non-linear optical responses.

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All authors contributed to the concept and design of the study. Data preparation, collection, and analysis were performed by all authors. All authors read and approved the final manuscript.

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Correspondence to Mohammad Ali Haddad.

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Amir Namiq Hassan declares that he has no conflict of interest. Mohammad Ali Haddad declares that he has no conflict of interest. Moein Golestanifar declares that he has no conflict of interest. Abbas Behjat declares that he has no conflict of interest.

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Hassan, A.N., Haddad, M.A., Golestanifar, M. et al. Non-linear Optical Response as a Food Authentication: Investigation of Non-linear Optical Properties of Edible Oils by Spatial Self-Phase Modulation (SSPM) Method. Food Anal. Methods 16, 1392–1402 (2023). https://doi.org/10.1007/s12161-023-02514-4

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  • DOI: https://doi.org/10.1007/s12161-023-02514-4

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