Two-photon absorption and nonlinear refraction of birefringent mesoporous silicon films
| Autor: | S. V. Zabotnov, V.Y. Timoshenko, Vladimir Ya. Gayvoronsky, Pavel K. Kashkarov, Yu.V. Gromov, M. A. Kopylovsky, Leonid A. Golovan, N. A. Piskunov |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Physics
Birefringence Silicon Condensed matter physics business.industry Nanocrystalline silicon chemistry.chemical_element Nonlinear optics Statistical and Nonlinear Physics Laser Two-photon absorption Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention chemistry law Optoelectronics Figure of merit Electrical and Electronic Engineering business Order of magnitude |
| Zdroj: | Quantum Electronics. 41:257-261 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qe2011v041n03abeh014416 |
| Popis: | The self-action of light in birefringent mesoporous silicon films is studied using picosecond laser pulses. Two mechanisms of self-action of light in mesoporous silicon are found. One of them manifests itself at laser intensities below 3 MW cm-2 and tends to saturation. The other dominates at intensities above 10 MW cm-2. The former is related to the resonant excitation of electronic states on the surface of silicon nanocrystals, whereas the latter is due to the local fields in the nanocomposite. For the aforementioned ranges of the laser intensity, the cubic nonlinear susceptibility of the films exceeds that of single-crystal silicon by six and four orders of magnitude, respectively, and the figure of merit for the films exceeds that for single-crystal silicon by an order of magnitude. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|