Prof. Igor Meglinski, Univ. of Oulu

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Le Professuer Igor Meglinski de l’University d’Oulu, Opto-Electronics and Measurement Techniques Département en Finlande donnera un seminaire intitulé "Perspectives of complex vector beams with orbital angular momentum for application in optical biopsy and tissues characterization" le jeudi 4 octobre 2018 à 11h00 en Salle Pierre Cotton de l’Institut Fresnel.

Résumé :
In turbid tissue-like scattering medium the conventional polarized light, scattered multiple number of times, is depolarized, and the depolarization rate depends strongly on the size and shape of scattering particles, as well as on the number of scattering events. In fact, the structure of light can be more complicated when the polarization of light across the laser beam can be radially or azimuthally polarized and carry orbital angular momentum. When these structured light beams, such as cylindrical vector beam (CVB) and/or Laguerre-Gaussian (LG) beams, propagates through a turbid tissue-like scattering medium, either anisotropic or inhomogeneous, the spin or angular momentum are changed that leads to spin-orbit interaction. The spin-orbit interaction leads to the mutual influence of the polarization and the trajectory of the light propagation. We investigate the applicability of using CVB and LG beams for optical biopsy. In current presentation propagation of CVB and LG beams in anisotropic turbid tissue-like scattering media is considered in comparison to conventional Gaussian beams. We demonstrate that by applying CVB and LG beams the contrast of visibility becomes at least twice higher in comparison to the conventional tissue polarimetry approach. Both experimental and theoretical results suggest that there is a high potential in application of structured light beams in tissue diagnosis.

Biographie :
Igor Meglinski is a full professor leading the Biophotonics and Biomedical Diagnostics research at the University of Oulu, Finland. He obtained PhD degree in Biophysics and Biomedical Optics at the interface between University of Pennsylvania/USA and Saratov State University/Russia in 1997, under the supervision of Professor Britton Chance (known as “father of modern biophysics and biomedical optics”). His research interests lie at the interface between physics, biomedical engineering, medicine and biological sciences, focusing on the development of new sensors and non-invasive optical diagnostic/imaging techniques and their applications in medicine & biology, material sciences, combustion, pharmacy, environmental monitoring, agricultural, food processing and the health care industries. Prof. Meglinski is author and/or co-author of over 300 papers in peer-reviewed scientific journal, conference proceedings and book chapter and delivered over 600 presentations at a range of conferences, symposia and workshops, including about 270 invited and plenary lectures and keynote talks. He is Chartered Physicist (CPhys) and Engineer (CEng), Fellow of the Institute of Physics (FInstP), Senior Member of IEEE and Fellow of SPIE.

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