التفاصيل البيبلوغرافية
| العنوان: |
Picosecond measurements of optical nonlinearities in King's complex and synthesized analogues |
| المؤلفون: |
Arthur L. Smirl, Graham R. Allan, Lee W. Tutt, Marvin B. Klein, Thomas F. Boggess, Steven J. Rychnovsky, Alan Kost |
| المصدر: |
SPIE Proceedings. |
| بيانات النشر: |
SPIE, 1992. |
| سنة النشر: |
1992 |
| مصطلحات موضوعية: |
Optics, Materials science, business.industry, Scattering, Excited state, Picosecond, Nonlinear optics, Nanosecond, business, Absorption (electromagnetic radiation), Ground state, Molecular physics, Excitation |
| الوصف: |
We have measured the photodynamics of reverse saturable absorption (RSA) in solutions of cyclopentadienyliron carbonyl tetramer (King's complex) using picosecond pump-probe techniques. Similar preliminary measurements in solutions of synthesized variations of the King's complex indicate that the excited state transition responsible for the observed RSA is most likely a second d-d transition within the metal core of the molecule. On time scales of hundreds of picoseconds, the observed RSA in the King's complex is well characterized by a three-level rate-equation, singlet-state absorption model, where the excited-state cross section is greater than that of the ground state. On nanosecond timescales and at fluences above 200 mJ.cm-2, however, we observe the onset of a response that is consistent with a thermally induced scattering process. Further evidence of this scattering is provided by angularly-resolved measurements of the transmitted and back-scattered signals for nanosecond excitation. When the King's complex is incorporated in a solid host negligible scatter was observed and the response is completely described by the singlet parameters extracted from the picosecond measurements. The observation of, scatter from solution, together with a time- resolved decay to the ground state that is rapid (approximately 120 ps) and largely nonradiative in this molecule, indicate that solutions of King's complex may provide a mechanism for efficiently generating thermal nonlinearities on a subnanosecond timescale.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
| تدمد: |
0277-786X |
| DOI: |
10.1117/12.138059 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_________::891e77f688135fcd7eda494551b64d54
https://doi.org/10.1117/12.138059 |
| رقم الانضمام: |
edsair.doi...........891e77f688135fcd7eda494551b64d54 |
| قاعدة البيانات: |
OpenAIRE |