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Design of laser tweezers set-up and evaluation of its stiffness using equipartition theorem
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Optical tweezers can hold and move micro particles by using only a laser beam. The objective of this thesis work was first to design and build an optical tweezers setup and trap one micro-meter spherical particle. Second, we evaluated the trap stiffness using the equipartition theorem method. We found that the optical design allowed for trapping the particles and we measured the trap stiffness to 2.8 ± 0.9 pN/µm in the x direction and 2.6 ± 0.8 pN/µm in the y direction. The uneven trapping strength is due to the alignment of the lenses.

Place, publisher, year, edition, pages
2017.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-141914OAI: oai:DiVA.org:umu-141914DiVA, id: diva2:1157250
Subject / course
Fysik C - Examensarbete
Available from: 2017-11-17 Created: 2017-11-15 Last updated: 2017-11-17Bibliographically approved

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