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University Lecturer Nina Reistad MSc, PhD

Nina Reistad

Senior lecturer

University Lecturer Nina Reistad MSc, PhD

Two-layer reconstruction of Raman spectra in diffusive media based on an analytical model in the time domain

Author

  • Stefan Susnjar
  • Fabrizio Martelli
  • Sara Mosca
  • Sanathana Konugolu Venkata Sekar
  • Johannes Swartling
  • Nina Reistad
  • Andrea Farina
  • Antonio Pifferi

Summary, in English

We derive and validate an analytical model that describes the migration of Raman scattered photons in two-layer diffusive media, based on the diffusion equation in the time domain. The model is derived under a heuristic approximation that background optical properties are identical on the excitation and Raman emission wavelengths. Methods for the reconstruction of two-layer Raman spectra have been developed, tested in computer simulations and validated on tissue-mimicking phantom measurements data. Effects of different parameters were studied in simulations, showing that the thickness of the top layer and number of detected photon counts have the most significant impact on the reconstruction. The concept of quantitative, mathematically rigorous reconstruction using the proposed model was finally proven on experimental measurements, by successfully separating the spectra of silicone and calcium carbonate (calcite) layers, showing the potential for further development and eventual application in clinical diagnostics.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Engineering Health
  • Atomic Physics
  • Centre for Environmental and Climate Science (CEC)
  • LTH Profile Area: Photon Science and Technology

Publishing year

2023-11-15

Language

English

Pages

40573-40591

Publication/Series

Optics Express

Volume

31

Issue

24

Document type

Journal article

Publisher

Optical Society of America

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1094-4087