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| Author(s): |
Vinicius Tribuzi Rodrigues Pinheiro Gomes
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2013-04-19 |
| Examining board members: |
Cleber Renato Mendonça;
Andréa Simone Stucchi de Camargo Alvarez Bernardez;
Gregorio Couto Faria;
Christiano José Santiago de Matos;
Leonardo de Souza Menezes
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| Advisor: | Cleber Renato Mendonça |
| Abstract | |
This work demonstrates the use of two-photon photopolymerization in the fabrication of microstructures doped with organic compounds and gold nanoparticles. The ability to produce microstructures with different properties is extremely relevant, because it opens the possibility for the development of a new generation of optical devices. Besides, we have accomplished the connection between fabricated microstructures and excitation sources by means of silica nanowires. The connection among structures and with external means of detection and excitation is an essential step towards the development of new technological breakthrough in photonic microcircuits. We have explored the resin doping possibilities by using: (i) a fluorescent compound, (ii) a photoinduced birefringent compound and (iii) gold nanoparticles. Rhodamine B doped microstructures present good structural integrity and fluorescence, and were able to demonstrate the connection of microelements with external means of excitation. Through the use of nanofiber tapers and micromanipulators, we have shown the selective excitation capability of this method by guiding Ar+ laser light onto one single microstructure. Birefringent samples were obtained by doping the resin with the azopolymer HEMA-DR13. We have assembled an apparatus that allows observing the photoinduced birefringence dynamics, which represents a great step towards a better characterization of these kinds of microelements. Based on this study we were able to achieve a residual birefringence fraction of 35% in microscopic samples. Finally, we have proposed a new method for the doping of polymeric microstructures with gold nanoparticles. Because it is an indirect doping technique, it prevents gold nanoparticles from interfering with the microfabrication process. Thus, the work presented here paves the way for the fabrication of functional microdevices with a wide range of special properties, as well as for the connection of these microstructures for photonic microcircuit. (AU) | |
| FAPESP's process: | 08/10728-3 - Fabrication of optically active polymeric microstructures integrated by silica nanofibers |
| Grantee: | Vinicius Tribuzi Rodrigues Pinheiro Gomes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |