Laser Trapping and crystallization dynamics of L-phenylalanine at solution surface

Ken Ichi Yuyama, Sugiyama Teruki*, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We present laser trapping behavior of l-phenylalanine (l-Phe) at a surface of its unsaturated aqueous solution by a focused continuous-wave (CW) near-infrared (NIR) laser beam. Upon the irradiation into the solution surface, laser trapping of the liquid-like clusters is induced concurrently with local laser heating, forming an anhydrous plate-like crystal at the focal spot. The following laser irradiation into a central part of the plate-like crystal leads to laser trapping at the crystal surface not only for l-Phe molecules/clusters but also for polystyrene (PS) particles. The particles are closely packed at crystal edges despite that the crystal surface is not illuminated by the laser directly. The molecules/clusters are also gathered and adsorbed to the crystal surface, leading to crystal growth. The trapping dynamics and mechanism are discussed in view of optical potential formed at the crystal surface by light propagation inside the crystal.

Original languageEnglish
Pages (from-to)2436-2440
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number15
StatePublished - 1 Aug 2013


  • crystal surface
  • L-phenylalanine
  • laser trapping
  • light propagation
  • solution surface

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