Fresnel reflectance in refractive index estimation of light scattering solid particles in immersion liquid

Räty, J.; Niskanen, I.; Peiponen, K.-E.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p231112
Academic Journal
The refractive index of homogenous particle population can be determined by the so-called immersion liquid method. The idea is to find a known liquid whose refractive index matches the index of the particles. We report on a method that simultaneously obtains the refractive index of particles and that of the immersion liquid. It is based on a system using internal light reflection and Fresnel’s theory. The method includes a series of straightforward reflection measurements and a fitting procedure. The validity of the method was tested with CaF2 particles. The method has applications within scientific studies of microparticles and nanoparticles or micro-organism in suspensions. It can be also be utilized in industry for the detection of the refractive index of products involving particles for the purpose of improvement of product quality.


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