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| Author(s): |
Leonardo Andre Ambrosio
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação |
| Defense date: | 2009-08-31 |
| Examining board members: |
Hugo Enrique Hernández Figueroa;
Antonio Robeiro Sapienza;
Antonio Sergio Bezarra Sobra;
Jose Joaquín Lunazzi;
Leonardo Lorenzo Bravo Roger
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| Advisor: | Hugo Enrique Hernández Figueroa |
| Abstract | |
In this thesis, we explore some applications of localized beams in FSO - Free Space Optics - and optical tweezers, greater emphasis been given to the second one. For FSO, we show that it is possible to choose the desired longitudinal intensity pattern by using optical elements adequately modeled in their phase functions: the axicons. In this way, these beams could be uses for optical alignment of the link. In the case of optical tweezers, we investigate the possibility that it will soon be possible to design and build homogeneous spherical particles, in the micron scale, with negative refractive index (the so called DNG particles, or Double-Negative particles), and we verify some properties related to optical trapping, both for Gaussian and Bessel beams, in the optics ray regime and in the more general electromagnetic case. The idea that particles with refractive index higher than the medium in which it is immersed is attracted to regions of high intensity, whereas it is attracted to regions of low intensity when its refractive index is lower than the medium, although valid for conventional particles - those with positive refractive index - must be revisited for DNG particles. (AU) | |