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Design of a Laser Tweezers Set-up and Evaluation of its Stiffness Using the Power Spectrum Method
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
2017 (engelsk)Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
Abstract [en]

Laser tweezers is a method that allows for manipulation of transparent particles in three dimensions by using a focused laser beam. If a spherical particle is trapped it is also possible to measure forces since the trapped particle is confined in a harmonic potential. In this work, we designed a laser tweezers set-up and investigated the forces in a trap using the power spectrum method. With a 0.67 mW power at the focus of the objective we trapped one-micron particles and calibrated the stiffness of the trap in both the x- and y-direction and found the trap stiffness to be 1.0(3) pN/μm and 0.9(2) pN/μm, respectively. This even value shows that our trap is symmetric.

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2017.
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Identifikatorer
URN: urn:nbn:se:umu:diva-142053OAI: oai:DiVA.org:umu-142053DiVA, id: diva2:1158061
Fag / kurs
Fysik C - Examensarbete
Tilgjengelig fra: 2017-11-17 Laget: 2017-11-17 Sist oppdatert: 2017-11-17bibliografisk kontrollert

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