Infrared reflectance and responsivity of PbBiSrCaCuO films

Linh Phong Ngo; Ishiang Shih; Philips Laou

doi:10.1117/12.188630

17 October 1994 Infrared reflectance and responsivity of PbBiSrCaCuO films

Linh Phong Ngo, Ishiang Shih, Philips Laou

Proceedings Volume 2269, Infrared Technology XX; (1994) https://doi.org/10.1117/12.188630
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

PbBiSrCaCuO films with a predominant Bi₂Sr₂Ca₂Cu₃O₁₀ superconducting phase were prepared on (100) MgO and LaAlO₃ substrates. The radiative properties of the film-substrate composites were investigated at room temperature and at temperatures near T_c in the wavelength band of 2 - 17 micrometers . For the film parameters used in this experiment, the near normal-incidence values of the reflectance were large while those of the transmittance were very small. No significant change in reflectance was observed as the film underwent a superconducting-normal transition in the vicinity of T_c. However, the reflectance decreased with decreasing film thickness and radiation wavelength. It could be verified that the substrate has a negligible effect on overall radiative properties when film thickness is sufficiently large. To determine the response mode of the film at infrared wavelengths, photoresponses to short laser pulses were measured. From the temperature- dependent behavior of transient structure and responsivity, the thermal origin of the photoresponse could be confirmed.

Citation Download Citation

Linh Phong Ngo, Ishiang Shih, and Philips Laou "Infrared reflectance and responsivity of PbBiSrCaCuO films", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); https://doi.org/10.1117/12.188630

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