Uncooled bolometer response of a low noise La2/3Sr1/3MnO3 thin film -: art. no. 204103

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. At 335 K the temperature coefficient of the resistance of a 100-mu m-wide, 300-mu m-long LSMO line was 0.017 K-1 and the normalized Hooge parameter was 9x10(-30) m(3), 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 8.1x10(-10) W Hz(-1/2) and 3.3x10(-10) W Hz(-1/2) at 30 Hz and above 1 kHz, respectively. Simple considerations on bias current conditions and thermal conductance G are finally given for further sensitivity improvements using LSMO films. (C) 2005 American Institute of Physics.