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Proceedings Paper

Thermal properties of optical-quality diamond films (Invited Paper)
Author(s): John E. Graebner; Sungho Jin
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Paper Abstract

Using several new techniques, we have made accurate thermal conductivity (K) measurements on CVD diamond films ranging from visually opaque to clear. The optical transparency and thermal conductivity are found to be correlated, which is consistent with the fact that many of the defects that scatter phonons also scatter photons. We find that K is anisotropic, due to phonon scattering by the roughly cone-shaped columnar microstructure of typical films. The local K also shows a gradient with respect to position--near the large-grained top surface of thick films, the local K can be as much as four times higher than near the fine-grained bottom (substrate) surface. Near the top surface of the best films, the local K rivals and may exceed the best gem-quality single crystal diamonds. One might expect the local optical transmissivity likewise to be comparable to high-quality bulk diamond.

Paper Details

Date Published: 20 November 1992
PDF: 11 pages
Proc. SPIE 1759, Diamond Optics V, (20 November 1992); doi: 10.1117/12.130770
Show Author Affiliations
John E. Graebner, AT&T Bell Labs. (United States)
Sungho Jin, AT&T Bell Labs. (United States)


Published in SPIE Proceedings Vol. 1759:
Diamond Optics V
Albert Feldman; Sandor Holly, Editor(s)

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