Self assembled nanoparticle aggregates from line focused femtosecond laser ablation

Craig A. Zuhlke, Dennis R. Alexander, John C. Bruce, Natale J. Ianno, Chad A. Kamler, Weiqing Yang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


In this paper we present the use of a line focused femtosecond laser beam that is rastered across a 2024 T3 aluminum surface to produce nanoparticles that self assemble into 5-60 micron diameter domed and in some cases sphere-shaped aggregate structures. Each time the laser is rastered over initial aggregates their diameter increases as new layers of nanoparticles self assemble on the surface. The aggregates are thus composed of layers of particles forming discrete layered shells inside of them. When micron size aggregates are removed, using an ultrasonic bath, rings are revealed that have been permanently formed in the sample surface. These rings appear underneath, and extend beyond the physical boundary of the aggregates. The surface is blackened by the formation of these structures and exhibits high light absorption.

Original languageEnglish (US)
Pages (from-to)4329-4339
Number of pages11
JournalOptics Express
Issue number5
StatePublished - Mar 1 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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