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Using linear polarization for sensing and monitoring nanoparticle purity

Ángela I. Barreda Gomez, Juan M. Sanz, Rodrigo Alcaraz de la Osa, José M. Saiz, Fernando Moreno, Francisco González, Gorden Videen, Francis Berghmans, Anna G. Mignani
2016 Optical Sensing and Detection IV  

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We analyze the effect of contaminants on the quadrupolar magnetic, dipolar electric and dipolar magnetic resonances of silicon nanoparticles (NPs) by considering the spectral evolution of the linear polarization degree at right angle scattering configuration, P L (90º). From an optical point of view, a decrease in the purity of silicon nanoparticles due to the presence of contaminants impacts the NP effective refractive index. We study this effect for a silicon nanosphere of radius 200 nm
more » ... ed in different media. The weakness of the resonances induced on the P L (90º) spectrum because of the lack of purity can be used to quantify the contamination of the material. In addition, it is shown that Kerker conditions also suffer from a spectral shift, which is quantified as a function of material purity.
doi:10.1117/12.2227774 fatcat:4urx7c5hpzbfvhvmn4hlqtewnu
Citation

Ángela I. Barreda Gomez, Juan M. Sanz, Rodrigo Alcaraz de la Osa, José M. Saiz, Fernando Moreno, Francisco González, Gorden Videen, Francis Berghmans, Anna G. Mignani. "Using linear polarization for sensing and monitoring nanoparticle purity." Optical Sensing and Detection IV (2016)