Thickness-dependent radiative properties of Y-Ba-Cu-O thin films

P. E. Phelan, G. Chen, C. L. Tien

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Some applications of high-temperature superconductors where their thermal radiative behavior is important, such as bolometers, optically-triggered switches and gates, and space-cooled electronics, require the superconductor to be in the form of a very thin film whose radiative behavior cannot be adequately represented by a semi-infinite analysis. Two properties of particular importance are the film absorptance and the combined film/substrate absorptance, which are crucial to the operation of many devices. Here, calculations of the absorptance of superconducting-state Y-Ba-Cu-O films on MgO substrates suggest that for film thicknesses less than about 50 nm, a decrease in the film thickness less than increase in both the film absorptance and the film/substrate absorptance. Furthermore, the film absorptance is maximum at some optimal value of film thickness. Assuming the film to be a smooth, continuous slab with a refractive index equal to that of bulk Y-Ba-Cu-O is verfied, at least in the normal state and for films as thin as 35 nm, by room-temperature reflectance and transmittance measurements.

Original languageEnglish (US)
Title of host publicationASME/JSME Thermal Engineering Joint Conference
PublisherPubl by ASME
Pages137-145
Number of pages9
ISBN (Print)0791806154
StatePublished - Dec 1 1991
Externally publishedYes
EventProceedings of the 3rd ASME/JSME Thermal Engineering Joint Conference Part 4 (of 5)OA - Reno, NV, USA
Duration: Mar 17 1991Mar 22 1991

Publication series

NameASME/JSME Thermal Engineering Joint Conference

Other

OtherProceedings of the 3rd ASME/JSME Thermal Engineering Joint Conference Part 4 (of 5)OA
CityReno, NV, USA
Period3/17/913/22/91

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Phelan, P. E., Chen, G., & Tien, C. L. (1991). Thickness-dependent radiative properties of Y-Ba-Cu-O thin films. In ASME/JSME Thermal Engineering Joint Conference (pp. 137-145). (ASME/JSME Thermal Engineering Joint Conference). Publ by ASME.