Last decades the effects of localization and focusing of light in turbid randomly inhomogeneous tissue-like scattering medium have been attracting a particular attention. Weak localization of light in disordered and weakly ordered biological tissue, polarization memory effect, correlations in transmission matrices, focusing light by wavefronts shaping have been widely exploited. Here, we represent an experimentally observed and theoretically confirmed new type of spatial localization of light within biological tissues. General description of the observed phenomenon based on Monte Carlo ray tracing model is provided. We find that innate body arrangements of individual adipocytes can act as a cascade of quasi-ordered microscale lenses confining propagation of light within adipose tissues similar to lens lightguides. The observed spatially-resolved longitudinal multi-focusing of light within disordered adipose biological tissues can naturally lead greater spatial control and enhance light-tissue interactions.
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Funding: Current study supported by the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 863214-NEUROPA project, Academy of Finland (Projects 314639, 325097), and partially by the Leverhulme Trust and The Royal Society (Ref. no.:APX111232 APEX Awards 2021).
- Computer Simulation
- Monte Carlo Method
- Scattering, Radiation