10 March 2014 Optical clearing at cellular level
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J. of Biomedical Optics, 19(7), 071409 (2014). doi:10.1117/1.JBO.19.7.071409
Strong light scattering in tissues and blood reduces the usability of many optical techniques. By reducing scattering, optical clearing enables deeper light penetration and improves resolution in several optical imaging applications. We demonstrate the usage of optical tweezers and elastic light scattering to study optical clearing [one of the major mechanisms—matching of refractive indices (RIs)] at the single particle and cell level. We used polystyrene spheres and human red blood cells (RBCs) as samples and glycerol or glucose water solutions as clearing agents. Optical tweezers kept single microspheres and RBCs in place during the measurement of light scattering patterns. The results show that optical clearing reduces the scattering cross section and increases g] . Glucose also decreased light scattering from a RBC. Optical clearing affected the anisotropy factor g of 23.25-μm polystyrene spheres, increasing it by 0.5% for an RI change of 2.2% (20% glycerol) and 0.3% for an RI change of 1.1% (13% glucose).
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Matti Kinnunen, Alexander V. Bykov, Juho Tuorila, Tomi Haapalainen, Artashes V. Karmenyan, Valery V. Tuchin, "Optical clearing at cellular level," Journal of Biomedical Optics 19(7), 071409 (10 March 2014). https://doi.org/10.1117/1.JBO.19.7.071409

Light scattering


Optical clearing




Optical spheres

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