SYMPOSIA PAPER Published: 01 January 1988
STP24439S

Deposition with Ultra-Fine Particles

Source

A study has been initiated into the possible uses of deposition with ultra-fine particles and/or clusters. The starting point was the Ionized Cluster Beam technique reported by Takagi et. al. Experimental studies in this laboratory strongly suggest that clusters cannot, in general, be formed in an adiabatic expansion of a pure metal vapor as had been claimed, although other mechanisms cannot be ruled out. Numerical simulations have also been carried out which support our conclusion.

However, it is well known that small particles or clusters can be condensed in a low pressure quenching gas. Work is now being directed toward exploiting these particles to produce materials composed of nanometer-sized “splats” somewhat analogous to those in plasma spray coatings. It is hoped this radical departure from the usual columnar structures of deposited materials can lead to improved damage thresholds in many types of optical coatings. The feasibility of this new approach will be discussed along with its potential merits.

Author Information

Day, AC
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Developed by Committee: F01
Pages: 308–308
DOI: 10.1520/STP24439S
ISBN-EB: 978-0-8031-5033-1
ISBN-13: 978-0-8031-4481-1