Modeling the transient optical parameters in laser-excited band gap materials
| Autor: | A. Rämer, Peter Balling, Baerbel Rethfeld, Lasse Haahr-Lillevang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Band gap Insulator (electricity) 02 engineering and technology semiconductors 01 natural sciences law.invention symbols.namesake Collision frequency law 0103 physical sciences 010306 general physics dielectric function Debye laser-matter interaction Drude model Condensed matter physics General Engineering Plasma 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics dielectrics Excited state symbols 0210 nano-technology |
| Zdroj: | Rämer, A, Haahr-Lillevang, L, Rethfeld, B & Balling, P 2016, ' Modeling the transient optical parameters in laser-excited band gap materials ', Optical Engineering, vol. 56, no. 1, 011015 . https://doi.org/10.1117/1.OE.56.1.011015 |
| DOI: | 10.1117/1.OE.56.1.011015 |
| Popis: | When band gap materials are irradiated with an ultrashort laser pulse, the free-carrier density increases tremendously. The resulting abrupt transformation from an insulator to a conducting material, where a large portion of the electrons is excited to the conduction band, induces huge changes in the optical parameters. The transient nature of these parameters is often modeled based on the Drude model, where there is much uncertainty concerning the Drude collision frequency. As this frequency has a great impact on the modeling results, this work discusses several approaches to its treatment. Additionally, we compare simulation results to experimental data discussing shortcomings of the Drude model in combination with a collision frequency based on Debye screening for dilute plasmas. |
| Databáze: | OpenAIRE |
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