Spectroscopy measurements of opaque material by nanophotonics iterative multi-plane technique

The interaction of light with different materials has been studied for hundreds of years in various research fields e.g., material analysis, quantum physics, biomedical optics, etc. This interaction is determined by the material's optical properties which are spectrally dependent. Spectroscopic methods examine the spectral dependence of the interaction, which reveals the material fingerprint. However, in opaque materials, their characterization is more complex and challenging due to the scattering. We have previously presented the iterative multi-plane optical property extraction (IMOPE) technique for characterizing materials using the reflection from turbid media. The reflection-based IMOPE, which estimates medium scattering properties, combines a theoretical model with an experimental setup and the multiple measurement GS algorithm. This technique was initially aimed for biomedical applications, where the red wavelengths are the desired radiation source due to higher penetration depths. However, as in spectroscopy, multiple wavelengths, rather than just one, can provide more accurate information about components within the sample. In this research, we introduce the spectral reflection-based IMOPE for extracting the reduced scattering coefficient of a medium in the blue regime.