TY - GEN
T1 - Thickness-dependent radiative properties of Y-Ba-Cu-O thin films
AU - Phelan, P. E.
AU - Chen, G.
AU - Tien, C. L.
PY - 1991
Y1 - 1991
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0026383785
SN - 0791806154
T3 - ASME/JSME Thermal Engineering Joint Conference
SP - 137
EP - 145
BT - ASME/JSME Thermal Engineering Joint Conference
PB - Publ by ASME
T2 - Proceedings of the 3rd ASME/JSME Thermal Engineering Joint Conference Part 4 (of 5)OA
Y2 - 17 March 1991 through 22 March 1991
ER -