LOW-COHERENCE REFLECTOMETRY OF FLUORESCENT RANDOM MEDIA

Isaeva A.A., Isaeva E.A., Yuvchenko S.A., Zimnyakov D.A. Low-coherence reflectometry of fluorescent random media. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2019, vol. 19, no. 3, pp. 387–393 (in Russian). doi: 10.17586/2226-1494-2019-19-3-387-393

Subject of Research. The paper considers the application of low-coherence reflectometry to the study of laser-pumped dyedoped random medium. The densely packed layers of titanium dioxide nanoparticles doped by rhodamine 6G are used as a laser-pumped dye-doped random medium. Method. The method of low-coherence reflectometry is based on analysis of the second and the third-order moments of intensity fluctuations of stochastic interference fields. Fluorescence radiation induced by the continuous laser pumping in fluorophor absorption band forms a stochastic interference pattern. The intensity distribution instochastic interference fields is described by the ratio of the coherence length of fluorescent radiation and the optical path length difference of the interfering field components. A confocal detection scheme is used for the stochastic interference analysis in the recorded signal. Main Results. The second and third-order moments of multiple scattered fluorescence intensity are calculated by experimentally obtained spatial fluctuations of fluorescent radiation limited by spectral range from 560 nm to 700 nm and spectral dependencies of moments are shown.The relationship is shown between the second and third-order statistical moments of the multiple scattered fluorescence radiation components and the coherence function and the probability density distribution of optical path lengths Practical Relevance. The considered method can be interpreted as an approach to the reconstruction of media optical transport characteristics based on comparison of the experimentally obtained statistical moments of fluorescence intensity fluctuations and theoretically-derived optical transport characteristics recovered by reverse Monte Carlo method. The study of radiation interaction with randomly inhomogeneous scattering media with high fluorescence quantum yield should be taken into account when analyzing functional and morphological states of complexly structured media, such as layers of biotissues, based on probing in the absorption bands of chromophores in spectroscopic methods.

1. Brunel L., Brun A., Snabre P., Cipelletti L. Adaptive speckle imaging interferometry: a new technique for the analysis of microstructure dynamics, drying processes and coating formation. Optics Express, 2007, vol. 15, no. 23, pp. 15250–15259. doi: 10.1364/oe.15.015250
2. Zakharov P., Cardinaux F., Scheffold F. Multispeckle diffusing- wave spectroscopy with a single-mode detection scheme. Physical Review E, 2006, vol. 73, no. 1. doi: 10.1103/physreve.73.011413
3. Liu B., Brezinski M.E. Theoretical and practical considerations on detection performance of time domain, Fourier domain, and swept source optical coherence tomography. Journal of Biomedical Optics, 2007, vol. 12, no. 4. doi: 10.1117/1.2753410
4. Van Rossum M.C.W., Nieuwenhuizen Th.M. Multiple scattering of classical waves: microscopy, mesoscopy, and diffusion. Reviews of Modern Physics Reviews of Modern Physics, 1999, vol. 71, no. 1, pp. 313–371. doi: 10.1103/revmodphys.71.313
5. Ushenko A.G. Laser polarimetry of polarization-phase statistical moments of the object field of optically anisotropic scattering layers. Optics and Spectroscopy, 2001, vol. 91, no. 2, pp. 313– 316. doi: 10.1134/1.1397917
6. Aoki T., Sakurai K. Photon statistics of partially polarized Gaussian light. Physics Review A, 1979, vol. 20, no. 4, pp. 1593– 1598. doi: 10.1103/physreva.20.1593
7. Bjork G., Soderholm J., Kim Y.-S., Ra Y.-S., Lim H.-T., Kothe C., Kim Y.-H., Sanchez-Soto L.L., Klimov A.B. Central-moment description of polarization for quantum states of light. Physics Review A, 2012, vol. 85, no. 5. doi: 10.1103/physreva.85.053835
8. Bi R., Dong J., Lee K. Multi-channel deep tissue flowmetry based on temporal diffuse speckle contrast analysis. Optics Express, 2013, vol. 21, no. 19, pp. 22854–22861. doi: 10.1364/oe.21.022854
9. Zimnyakov D.A., Sina J.S., Yuvchenko S.A., Isaeva E.A., Chekmasov S.P., Ushakova O.V. Low-coherence interferometry as a method for assessing the transport parameters in randomly inhomogeneous media. Quantum Electronics, 2014, vol. 44, no. 1, pp. 59–64. doi: 10.1070/qe2014v044n01abeh015292
10. Karamata B., Laubscher M., Leutenegger M., Bourquin S., Lasser T., Lambelet P. Multiple scattering in optical coherence tomography. I. Investigation and modeling. Journal of the Optical Society of America A, 2005, vol. 22, no. 7, pp. 1369–1379. doi: 10.1364/josaa.22.001380
11. Zimnyakov D.A., Asharchuk I.A., Yuvchenko S.A., Sviridov A.P. Stochastic interference of fluorescence radiation in random media with large inhomogeneities. Optics Communication, 2017, vol. 387, pp. 121–127. doi: 10.1016/j.optcom.2016.11.045
12. Angelsky O.V., Maksimyak P.P. The investigation of the transformation phenomenon of the longitudinal correlation function of the field propagating in the light scattering medium. Optics and Spectroscopy, 1986, vol. 60, no. 2, pp. 331–336.
13. Angelsky O.V., Maksimyak A.P., Maksimyak P.P., Hanson S.G. Optical correlation diagnostics of rough surfaces with large surface inhomogeneities. Optics Express, 2006, vol. 14, no. 16, pp. 7299–7311. doi: 10.1364/oe.14.007299
14. Goodman J.W. Statistical Optics. Wiley, 2000, 567 p.
15. Nieuwenhuizen T.M., Van Rossum M.C. Intensity distributions of waves transmitted through a multiple scattering medium. Physical Review Letters, 1995, vol. 74, no. 14, pp. 2674–2677. doi: 10.1103/physrevlett.74.2674
16. Kogan E., Kaveh M. Random-matrix-theory approach to the intensity distributions of waves propagating in a random medium.
Physical Review B, 1995, vol. 52, no. 6, pp. R3813–R3815. doi: 10.1103/physrevb.52.r3813
17. Thompson C.A., Webb K.J., Weiner A.M. Imaging in scattering media by use of laser speckle. Journal of the Optical Society of America A, 1997, vol. 14, no. 9, pp. 2269–2277. doi: 10.1364/josaa.14.002269
 

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