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Two-Photon Fluorescence Study of Olive Oils at Different Excitation Wavelengths

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Abstract

Two-photon fluorescence (TPF) of olive oils is discovered and observed experimentally for the first time. Variations of the single-photon fluorescence (SPF) and TPF with the excitation wavelength are investigated for four different olive oils. The results show that fluorescence of the cosmetic olive oils (COO) is very weak and exhibits only one spectral peak around 490 nm. While for the ordinary edible oils (OEO) whether they are during their shelf life or not, their fluorescence spectra may exhibit multiple peak structures. The short-term natural expiration only slightly weakens TPF of OEO. Moreover, the excitation wavelength affects the OEO spectra considerably in terms of the spectral peak number, the spectral peak position, and spectral shapes. When the excitation wavelength decreases from 700 nm, the whole TPF of the OEO also decreases. Relatively, however, the short wave band will decrease and disappear more quickly. While for the SPF, the long wave band will decrease and disappear first. The optimal excitation wavelengths to make the TPF strongest are around 700 nm and 640 nm for OEOs and COO, respectively. And effects of temperature on SPF and TPF of extra virgin olive oil are also explored. This work may be of significance for its potential applications in TPF detection and two-photon laser.

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All the data and materials from this manuscript will be made available on request.

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Funding

The work is supported by Sichuan Science and Technology Program (No.2020YJ0431).

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Authors and Affiliations

  1. College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu, 610225, Sichuan, China

    Jiameng Xu, Xianqiong Zhong, Mengyu Sun, Qili Chen, Zikang Zeng, Yingsen Chen & Ke Cheng

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  1. Jiameng Xu
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  2. Xianqiong Zhong
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  3. Mengyu Sun
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  4. Qili Chen
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  5. Zikang Zeng
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Contributions

Zhong XQ conceived the research thought, designed the experimental scheme, revised and edited the manuscript. Xu JM processed and analyzed the experimental data, organized the figures in the manuscript, and wrote the first draft of the manuscript. Xu JM, Sun MY, Chen QL, Zeng ZK, and Chen YS performed fluorescence measurements. Cheng K provided assistance for the experiments and participated in discussing and demonstrating the research results.

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Correspondence to Xianqiong Zhong.

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Xu, J., Zhong, X., Sun, M. et al. Two-Photon Fluorescence Study of Olive Oils at Different Excitation Wavelengths. J Fluoresc 31, 609–617 (2021). https://doi.org/10.1007/s10895-021-02692-6

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  • DOI: https://doi.org/10.1007/s10895-021-02692-6

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