umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Construction of an Optical Tweezers Instrumentation and Validation of Brownian motion
Umeå University, Faculty of Science and Technology, Department of Physics. (The Biophysics and Biophotonics group)
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

We constructed a standalone optical trapping system that was steerable in three dimensions and allowed for sufficient imaging of one цm particles with a CCD camera. The motion of the trapped particles was monitored by both a position sensitive detector as well with the CCD camera. The trap stiffness was evaluated by the power spectrum method and the equipartition theorem. For calibration of the stiffness of the trap, we found that the power spectrum method with data assessed by the PSD was most straightforward and accurate. The equipartition method was compromised by noise, low resolution and the bandwidth of the detector. With a HeNe laser run at 10 mW output power the trap strength of our system reached ~2 pN/um. The results also showed a decrease in the trap stiffness and particle's position variance when the size of trapped particles increased.

Place, publisher, year, edition, pages
2011.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-94771OAI: oai:DiVA.org:umu-94771DiVA: diva2:756228
Educational program
Bachelor of Science in Physics and Applied Mathematics
Supervisors
Examiners
Available from: 2014-11-06 Created: 2014-10-16 Last updated: 2014-11-06Bibliographically approved

Open Access in DiVA

fulltext(1063 kB)647 downloads
File information
File name FULLTEXT01.pdfFile size 1063 kBChecksum SHA-512
c7e88d144f3705ab0bed12918ecb4134cbec76aaf29925c0951b3898acaa009639ecd7990e389b8213cac42e485a29ade7d1472fd6c3ea997bf598cfe4548ca4
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Zhang, Hanqing
By organisation
Department of Physics
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
Total: 651 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 184 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf