Femtosecond laser trapping, assembling, and ejection dynamics of dielectric nanoparticles in solution

Hiroshi Masuhara, Jim Jui Kai Chen, Wei Yi Chiang, Anwar Usman, Sugiyama Teruki, Johan Hofkens

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

1 Scopus citations


We elucidated femtosecond laser trapping dynamics of Rayleigh particles by modifying the surface property of nanoparticles and changing the viscosity. Through bright field, dark field and backscattering images, we monitored ejection behavior of nanoparticles which takes place in the direction perpendicular to laser polarization and switched from one side to the other. For very hydrophobic nanoparticle, we succeeded in observing directly a transient assembly and confirmed that its formation is responsible to the directional ejection. Also the trapping dynamics was compared for femtosecond and continuous-wave lasers in highly viscous solvent, which gives a new viewpoint for understanding femtosecond laser trapping mechanism.

Original languageEnglish
Title of host publicationOptical Manipulation Conference
EditorsKeiji Sasaki, Takashige Omatsu, Hajime Ishihara
ISBN (Electronic)9781510619814
StatePublished - Apr 2018
EventOptical Manipulation Conference 2018 - Yokohama, Japan
Duration: 25 Apr 201827 Apr 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical Manipulation Conference 2018


  • Dielectric nanoparticle
  • Femtosecond laser
  • Optical assembling
  • Optical ejection
  • Optical trapping

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