Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.313
Publication date: 6th July 2018
Colloidal nanomaterials have interesting optical properties for light emitting applications. Because of their dispersive nature they are easily interchangeable in fabrication, since all the materials can be processed in the same way, as such a general framework for their use in devices is highly wanted. Besides this, it is necessary to understand thoroughly the physics behind all the different nanoparticles. Using the well-known Maxwell-Garnett effective medium approach1, and the Kramers-Kronig relation between the real and imaginary part of the dielectric function, we updated a script that previously only worked on Quantum Dots2-3, and now determines the refractive index and exctinction coefficient of any nanoparticle, either in dispersion or in a thin film, by using the absorption data and the depolarization factors of the material. In addition this script can also be used on Transient Absorption data, where the non-linear absorption is measured in function of a pump, allowing to determine the Transient Refractive Index, which can help to determine the interest of a material in terms of an optical modulator. As a case study, we applied the script to colloidal CdSe quantum wells or platelets. We studied TA data for both the visible range, and near-infra-red range, where an induced intraband peak was observed4. This is also verified by experiment, where phase changes in a material are directly observed.
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