Optical trapping assembling of clusters and nanoparticles in solution by CW and femtosecond lasers

Hiroshi Masuhara*, Teruki Sugiyama, Ken Ichi Yuyama, Anwar Usman

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Laser trapping of molecular systems in solution is classified into three cases: JUST TRAPPING, EXTENDED TRAPPING, and NUCLEATION and GROWTH. The nucleation in amino acid solutions depends on where the 1064-nm CW trapping laser is focused, and crystallization and liquid–liquid phase separation are induced by laser trapping at the solution/air surface and the solution/glass interface, respectively. Laser trapping crystallization is achieved even in unsaturated solution, on which unique controls of crystallization are made possible. Crystal size is arbitrarily controlled by tuning laser power for a plate-like anhydrous crystal of l-phenylalanine. The α- or γ-crystal polymorph of glycine is selectively prepared by changing laser power and polarization. Further efficient trapping of nanoparticles and their following ejection induced by femtosecond laser pulses are introduced as unique trapping phenomena and finally future perspective is presented.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalOptical Review
Volume22
Issue number1
DOIs
StatePublished - 1 Feb 2015

Keywords

  • Crystal growth
  • Crystal size
  • Femtosecond trapping
  • Laser trapping
  • Nucleation
  • Polymorph control

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