Femtosecond trapping efficiency enhanced for nano-sized silica spheres

Anwar Usman*, Wei Yi Chiang, Hiroshi Masuhara

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

10 Scopus citations


We present a comparison of optical trapping of 50-nm-sized silica nanospheres, suspended in water medium, by femtosecond laser pulses and by continuous wave laser beam. With bright field microscopic imaging, we demonstrated that intensity of scattering light at the focal area under fs-pulse mode is much higher than that under cw mode. This result offers a basic interpretation that trapping efficiency of nanometer-sized particles by the ultrashort laser pulses is higher than that by the cw mode at the same laser power. We interpret this finding by means of impulsive peak power of the femtosecond laser pulses.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation IX
StatePublished - 1 Dec 2012
EventOptical Trapping and Optical Micromanipulation IX - San Diego, CA, United States
Duration: 12 Aug 201216 Aug 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceOptical Trapping and Optical Micromanipulation IX
CountryUnited States
CitySan Diego, CA


  • Bright field microscopy
  • Continuous wave laser
  • Femtosecond laser pulses
  • Laser trapping
  • Silica nanospheres

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