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Pré-Publication, Document De Travail Année : 2005

Uncooled bolometer response of a low noise La2/3Sr1/3MnO3 thin film

Résumé

We report measurements of the optical responses of a La2/3Sr1/3MnO3 (LSMO) sample at a wavelength of 533 nm in the 300-400 K range. The 200 nm thick film was grown by pulsed laser deposition on (100) SrTiO3 substrate and showed remarkably low noise. At 335 K the temperature coefficient of the resistance of a 100 micrometers wide 300 micrometers long LSMO line was 0.017 K-1 and the normalized Hooge parameter was 9 e-30 m3, which is among the lowest reported values. We then measured an optical sensitivity at I = 5 mA of 10.4 V.W-1 and corresponding noise equivalent power (NEP) values of 8.1 e-10 W.Hz-1/2 and 3.3 e-10 W. Hz-1/2 at 30 Hz and above 1kHz, respectively. Simple considerations on bias current conditions and thermal conductance G are finally given for further sensitivity improvements using LSMO films. The performances were indeed demonstrated on bulk substrates with G of 10-3 W.K-1. One could expect a NEP reduction by three orders of magnitude if a membrane-type geometry was used, which makes this LSMO device competitive against commercially available uncooled bolometers.

Dates et versions

hal-00011178 , version 1 (12-10-2005)

Identifiants

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Laurence Méchin, Jean-Marc Routoure, Bruno Guillet, Fan Yang, Stéphane Flament, et al.. Uncooled bolometer response of a low noise La2/3Sr1/3MnO3 thin film. 2005. ⟨hal-00011178⟩
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