YBaCuO mid-infrared bolometers: Substrate influence on inter-pixel crosstalk

Gaugue, Alain; Testé, Philippe; Delerue, J.; Gensbittel, Aurélie; Luca, Antonio De; Kreisler, Alain; Voisin, F.; Klisnick, Geoffroy; Redon, M.

doi:10.1109/77.919458

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…Table 1 shows the parameters of the devices and the parameters used in the model. We have measured the devices made on both LaAlO 3 (9,10,11) and SrTiO 3 (3,4,5) and obtained similar response behaviours. Figure 7 shows the experimental results and fitting curves of devices 9, 10, and 11.…”

Section: Bias Temperaturementioning

confidence: 69%

Analytical modelling of the interpixel thermal crosstalk in superconducting edge-transition bolometer arrays

Bozbey¹,

Fardmanesh²,

Schubert³

et al. 2006

Supercond. Sci. Technol.

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We present an analytical thermal model to explain the crosstalk in YBCO edge-transition bolometer arrays. The verification of the model was tested on sample array devices made of 200 and 400 nm YBCO films on LaAlO 3 and SrTiO 3 substrates. The model presented was able to explain the effects of the various physical parameters of the devices, such as the film thickness, operating temperature, and the device separation, which cause different response behaviours based on the variation of the related thermal crosstalk characteristics. In addition, the model is valid above the crosstalk-free modulation frequencies, where the effects of the thermal crosstalk on the response of the devices are negligible.

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Section: Bias Temperaturementioning

confidence: 69%

Analytical modelling of the interpixel thermal crosstalk in superconducting edge-transition bolometer arrays

Bozbey¹,

Fardmanesh²,

Schubert³

et al. 2006

Supercond. Sci. Technol.

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“…Gaugue et al 30 have also developed a 2D analytic model and a 3D numerical model, with and without consideration of the thermal boundary conductance between film and substrate. They showed that the 2D model can be used to predict the optical responsivity of an illuminated pixel, and the 3D model to evaluate inter-pixel crosstalk taking into account the thermal interface.…”

Section: B Thermal Boundary Conductancementioning

confidence: 99%

Measurement of thermal conductance of La0.7Sr0.3MnO3 thin films deposited on SrTiO3 and MgO substrates

Aryan

Guillet

Routoure

et al. 2015

Applied Surface Science

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International audienceWe present measurements of the thermal conductance of thin-film-on-substrate structures that could serve as thin film uncooled bolometers. Studied samples were 75 nm thick epitaxial La0.7Sr0.3MnO3 thin films deposited on SrTiO3 (0 0 1) and MgO (0 0 1) substrates patterned in square geometries of areas ranging from 50 μm × 50 μm to 200 μm × 200 μm. The model allows estimating thermal boundary conductance values at the interface between film and substrate of 0.28 ± 0.08 × 106 W K−1 m−2 for LSMO/STO (0 0 1) and 5.8 ± 3.0 × 106 W K−1 m−2 for LSMO/MgO (0 0 1) from measurements performed in the static regime. Analytical expressions of thermal conductance and thermal capacitance versus modulation frequency are compared to measurements of the elevation temperature due to absorbed incoming optical power. The overall good agreement found between measurements and model finally provides the possibility to calculate the bolometric response of thin film bolometers, thus predicting their frequency response for various geometries

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“…As the number of pixels in an array increases and the size of the pixels decrease, the thermal crosstalk becomes a limiting factor in the design of transition edge bolometer arrays. Recently a number of studies have reported on the crosstalk in the bolometer arrays [1]- [3]. We have previously presented and analyzed the effects of temperature at transition and separation between the pixels on the crosstalk in the same type of bolometer arrays [4] and proposed a related analytical thermal model [5].…”

Section: Introductionmentioning

confidence: 99%

Substrate and Device Pattern Dependence of the Thermal Crosstalk in Y Ba$_2$Cu$_3$O$_{7-\delta}$ Transition Edge Bolometer Arrays

Bozbey

Fardmanesh

Schubert

et al. 2006

IEEE Trans. Appl. Supercond.

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Abstract-Using YBa 2 Cu 3 O 7(YBCO) thin films, pulsed laser deposited on 1-mm-thick LaAlO 3 or SrTiO 3 substrates, we made 4 1 pixel arrays of transition edge bolometers with separations between neighboring pixels ranging from 40 m to 170 m for testing purposes. We investigated the effects of the YBCO film thickness (200 and 400 nm), substrate material, and back-etching of the substrate, on the crosstalk between the pixels of the arrays. The investigation was based on the analysis of the voltage response of the dc current biased bolometers versus the modulation frequency of a near-infrared laser source. We observed that the bolometer arrays made of 400-nm-thick films had less interpixel thermal crosstalk than the 200-nm-thick films. The effect of substrate thickness on the response of the pixels was investigated by up to 500 m back-etching of the substrates. The bolometers made on back-etched LaAlO 3 substrates had anomalous crosstalk response behavior, which was effective at higher modulation frequencies. In addition, we present an analytical thermal model for explaining the observed effects of the thermal crosstalk on the response characteristics of the pixels of the arrays. We report the measured response and the anticipated thermal crosstalk of the characterized bolometers'. We describe the responses based on the thermal models and discrepancies from the model's predictions.

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YBaCuO mid-infrared bolometers: Substrate influence on inter-pixel crosstalk

Cited by 9 publications

References 5 publications

Analytical modelling of the interpixel thermal crosstalk in superconducting edge-transition bolometer arrays

Analytical modelling of the interpixel thermal crosstalk in superconducting edge-transition bolometer arrays

Measurement of thermal conductance of La0.7Sr0.3MnO3 thin films deposited on SrTiO3 and MgO substrates

Substrate and Device Pattern Dependence of the Thermal Crosstalk in Y Ba$_2$Cu$_3$O$_{7-\delta}$ Transition Edge Bolometer Arrays

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