Reversible assembly of gold nanoparticles confined in an optical microcage

Hiroyuki Yoshikawa*, Togo Matsui, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


As optical trapping by a focused laser beam is applied for nanoparticles, multiple particles are grasped in the focal spot and make an assembly. Gold nanoparticles confined in such a submicrometer optical cage show a characteristic extinction spectrum depending on laser power. The spectral change can be induced reversibly and repeatedly by tuning the laser power, demonstrating that the assembly of gold nanoparticles can be controlled by the gradient force. This is attributed to the soft confinement of nanoparticles dressed in electrostatic potential barriers.

Original languageEnglish
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Issue number6
StatePublished - 1 Jan 2004

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