Title: Optical trapping assembling of clusters and nanoparticles in solution by CW and femtosecond lasers
Authors: Masuhara, Hiroshi
Sugiyama, Teruki
Yuyama, Ken-ichi
Usman, Anwar
Department of Applied Chemistry
Institute of Molecular science
Keywords: Laser trapping;Femtosecond trapping;Nucleation;Crystal growth;Polymorph control;Crystal size
Issue Date: 1-Feb-2015
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 a-or c-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.
URI: http://dx.doi.org/10.1007/s10043-015-0029-1
ISSN: 1340-6000
DOI: 10.1007/s10043-015-0029-1
Volume: 22
Begin Page: 143
End Page: 148
Appears in Collections:Articles