Multiphoton-absorption induced ultraviolet luminescence of ZnO nanorods using low energy femtosecond pulses
| Autor: | Martin Bock, Enda McGlynn, Ruediger Grunwald, Markus Breusing, Mahua Biswas, Susanta Kumar Das, Daragh Byrne |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Photoluminescence business.industry Lasers General Physics and Astronomy Physics::Optics Laser medicine.disease_cause Spectrum analysis law.invention Condensed Matter::Materials Science Semiconductors law Femtosecond medicine Optoelectronics Nanotechnology Nanorod ZnO nanorods nonlinear business Luminescence Absorption (electromagnetic radiation) Ultrashort pulse Materials Ultraviolet |
| Zdroj: | Kumar Das, Susanta, Biswas, Mahua, Byrne, Daragh ORCID: 0000-0002-2040-9765 |
| Popis: | Multiphoton-absorption (MPA) induced ultraviolet (UV) luminescence of ZnO nanorods grown by vapor phase transport was demonstrated using ultrafast excitation at pulse energies in the few nanojoules range, directly generated by a Ti:sapphire laser oscillator at wavelengths around 800 nm. The dependence of the UV luminescence on the excitation density reveals a two-photon absorption process as the responsible excitation mechanism. The broad spectral bandwidth of the excitation pulses obviously promotes the feasibility of the observed two-photon channel. Theoretical estimates concerning the contribution of nonlinear absorbance strongly support the experimental findings. The essential conditions for proper utilization of this process are discussed. |
| Databáze: | OpenAIRE |
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