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Master's Dissertation
DOI
10.11606/D.76.2001.tde-16092008-101605
Document
Author
Full name
Newton Martins Barbosa Neto
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2001
Supervisor
Committee
Zilio, Sergio Carlos (President)
Borissevitch, Iouri
Nunes, Luiz Antonio de Oliveira
Title in Portuguese
Limitação óptica em complexos de porfirina e metaloporfirina
Keywords in Portuguese
Absorção de estados excitados
Limitação óptica
Porfirinas
Abstract in Portuguese
Limitadores ópticos são dispositivos que apresentam alta transmitância para baixas intensidades de luz incidente e, inversamente, baixa transmitância para altas intensidades, sendo usados como protetores contra danos em sensores ópticos e olhos humanos. Com o objetivo de estudarmos novos materiais com mecanismos não lineares eficientes para o processo de limitação, bem como novas geometrias ópticas, apresentamos neste trabalho o desenvolvimento de um limitador óptico baseado na absorção saturada reversa de porfirinas e metaloporfirinas. Construímos também um dispositivo baseado na configuração óptica bifocal, usando porfirina como absorvedor saturável reverso. Além disso, obtivemos parâmetros espectroscópicos do estado excitado pelos ajustes teóricos das curvas de transmitância, através da resolução de equações de taxa.
Title in English
Optical limiting in porphyrin and metaloporphyrin complexes
Keywords in English
Excited state absorption
Optical limiting
Porphyrins
Abstract in English
Optical limiters are devices with a high transmittance in the presence of low intensity light, and a considerable lower transmittance otherwise, been used as protectors against damage in optical sensors and human eyes. Aiming at searching for new materials and optical geometries efficient for optical limiting. We report on the development of an optical limiter based on the reverse saturable absorption in porphyrin and metalioporphyrins. We also built a device-based .on a cascade focus configuration, using free base porphyrin as the absorber. Besides, we obtain the excited state spectroscopy parameters by the theoretical fitting of transmittance curves, by solving a set of rate equations.
 
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Publishing Date
2008-09-17
 
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