Título: | OPTICAL TWEEZERS AND STRUCTURED LIGHT: TRAPPING MICROPARTICLES IN A DARK FOCUS | ||||||||||||
Autor: |
FELIPE ALMEIDA DA SILVA |
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Colaborador(es): |
THIAGO BARBOSA DOS SANTOS GUERREIRO - Orientador |
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Catalogação: | 13/JUN/2023 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=62836&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=62836&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.62836 | ||||||||||||
Resumo: | |||||||||||||
Optomechanics, the study of light-induced forces upon matter, has seen
tremendous advances in recent years with broad implications to all natural
sciences. Optical tweezers, for instance, are now widely used in physics,
chemistry and biology to trap nano- and micro-objects with a refractive
index greater than of its surrounding medium using typically Gaussian laser
beams. Generalizing these techniques, recent works began to explore higher-order states of the electromagnetic field and its superpositions for optical
trapping, creating beams with customized phase, mode and amplitude. These
new degrees of freedom allows for optical potentials beyond the harmonic
approximation, enabling virtually arbitrary potential forms and even time-dependent forces capable of inducing controlled motion on the trapped object.
Within this context of structured light beams, we can explore not only the
attractive forces between light and matter but the repulsive ones that arise
when the particle s refractive index is smaller than that of its medium. In
this work we explore both scenarios by creating holographic beams with a
Spatial Light Modulator (SLM). Specifically, we focus on the implementation
of the dark focus beam, or optical bottle beam, where particles may find
equilibrium in a region with no incidence of light. Experimental results are
presented and compared to Lorentz-Mie numerical simulations and possible
applications of these inverted optical tweezers in optomechanics and biology
are discussed.
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