Determination of refractive index, size, and solid content of monodisperse polystyrene microsphere suspensions for the characterization of optical phantoms
| Autor: | Yevhen Zelinskyi, Miran Bürmen, Peter Naglič, Boštjan Likar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lomni količnik
Materials science Mie scattering Dispersity Analytical chemistry Physics::Optics usmerjeno sipanje forward scattering 01 natural sciences meritve sipanja Collimated light Article Suspension (chemistry) 010309 optics 03 medical and health sciences udc:535 Dynamic light scattering teorija Mie 0103 physical sciences Mie theory scattering measurement 030304 developmental biology 0303 health sciences refractive index Scattering Atomic and Molecular Physics and Optics multiple scattering Condensed Matter::Soft Condensed Matter večkratno sipanje Diffuse reflection Refractive index Biotechnology |
| Zdroj: | Biomedical optics express, vol. 11, no. 4, 387619, pp. 1901-1918, 2020. |
| ISSN: | 2156-7085 |
| Popis: | Monodisperse polystyrene microspheres are often utilized in optical phantoms since optical properties such as the scattering coefficient and the scattering phase function can be calculated using the Mie theory. However, the calculated values depend on the inherent physical parameters of the microspheres which include the size, refractive index, and solid content. These parameters are often provided only approximately or can be affected by long shelf times. We propose a simple method to obtain the values of these parameters by measuring the collimated transmission of polystyrene microsphere suspensions from which the wavelength-dependent scattering coefficient can be calculated using the Beer-Lambert law. Since a wavelength-dependent scattering coefficient of a single suspension is insufficient to uniquely derive the size, refractive index and solid content by the Mie theory, the crucial and novel step involves suspending the polystyrene microspheres in aqueous sucrose solutions with different sucrose concentrations that modulates the refractive index of the medium and yields several wavelength-dependent scattering coefficients. With the proposed method, we are able to obtain the refractive index within 0.2% in the wavelength range from 500 to 800 nm, the microsphere size to approximately 15 nm and solid content within 2% of their respective reference values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|