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Study of Functional Surface Structures on Metals

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Technical Report,15 Jul 2015,14 Sep 2018

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University of Rochester Rochester United States

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The PIs lab has developed a laser processing technique that renders highly reflective metals either totally absorptive or selectively reflective for only a certain color of light, leading to the creation of the so-called black and colored metals. The black and colored metals also possess significantly altered radiative and wetting properties and may find many Army applications, such as making better sensors, detectors, solar energy collectors, laser marking, more efficient cooling in military machinery, and improved stealth technology. The various properties of the black and colored metals come from surface structures at micro- and nanoscales formed by the laser irradiation. However, little is known beyond this basic understanding, and the creation of the black and colored metals are mostly from trial and error. In this project, we developed a number of techniques to monitor the dynamics of laser-induced surface structuring in order to obtain an optimal procedure to produce the functionalities associated with the black and colored metals, which includes radiative, optical, and wetting properties. Extensive research has been explored for understanding surface structure formation and the exploration of novel surface structures. During this ARO project, a DARPA seeding project named Infrared Signature Control was also performed as a supplement starting from March 2017 till the end of the project. The goal of this DARPA seeding project is to produce a micronano-structured Ti and Al surfaces that have controlled high reflection low emission in air transmission bands at 1-2.5 um, 3.1-5 um, and 8-13.3 um and low reflection high absorption in other bands.

Subject Categories:

  • Properties of Metals and Alloys
  • Lasers and Masers
  • Optics

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