High-Tc superconducting bolometer on chemically-etched 7 μm thick sapphire

Lakew, B.; Brasunas, J. C.; Piqué, Alberto; Fettig, Rainer K.; Mott, Brent; Babu, Sachidananda; Cushman, G. Mark

doi:10.1016/s0921-4534(99)00544-4

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…The film deposition technique (including the CeO 2 buffer layer) is similar to the one described previously [1]. A thin film of YBCO (1500 Å) was deposited on a patterned wafer as described above [5].…”

Section: Tes Bolometer Fabricationmentioning

confidence: 99%

“…Noise measurements were conducted with a 4 mA bias across the HTS thin film. The readout electronics and the measurement technique used have been described previously [1]. No gold black absorber was deposited.…”

Section: Tes Bolometer Fabricationmentioning

confidence: 99%

“…In our previous bolometers with sapphire substrate [1], low thermal mass was achieved by thinning (using chemical etching). Thermal isolation was achieved using Kevlar fiber suspension.…”

Section: Introductionmentioning

confidence: 99%

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Performance of a far-IR TES bolometer on monolithic sapphire membrane

2004

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The performance of a high Tc (~90 K) transition-edge superconducting (TES) bolometer on a monolithic sapphire membrane is presented and discussed. It is compared to the performance of a previous TES bolometer on non-monolithic sapphire substrate. The development and optimization of monolithic sapphire membranes is critical for the fabrication of 1 and 2-D arrays of TES bolometers. Moderately cooled and optimized TES bolometers are expected to be the replacements of choice for thermopiles and other room temperature thermal sensors on far IR instruments on future planetary missions.

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Section: Tes Bolometer Fabricationmentioning

confidence: 99%

Section: Tes Bolometer Fabricationmentioning

confidence: 99%

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Performance of a far-IR TES bolometer on monolithic sapphire membrane

2004

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“…Superconductor transition-edge sensors are one of the most sensitive radiation detectors in the range of infrared to far infrared [1,2]. One of the most effective parameters in the sensitivity of these types of detectors is their surface absorption that determines the efficiency of radiation absorption.…”

Section: Introductionmentioning

confidence: 99%

Effect of the nano-structure Cu-carbon composite absorber layer on the response of superconductive YBCO TEBs

Kokabi

Moftakharzadeh

Ghodselahi

et al. 2008

J. Phys.: Conf. Ser.

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Effect of the nano-structure Cu-carbon composite absorber layer on the response of superconductive YBCO TEBs Abstract. We have used a nanostructure copper composite layer as the absorber for infrared radiation on superconductive YBCO bolometers. The Cu composite has the advantage of having little destructive effects on superconductive YBCO material and its deposition process is done at low temperature. The bolometer is made of 200nm thick YBCO film on 1mm thick LaAlO 3 and SrTiO 3 crystalline substrates, deposited using pulsed laser deposition technique. The Cu composite layers were made by decomposition of C 2 H 2 and co sputtering of Cu target in an RF system. The layer was deposited on an insulating buffer layer of diamond like carbon (DLC). The spectral absorption of the Cu composite layer was also measured through measurements of the spectral transmission and reflection of the layer on various substrates. The control of the absorption of the composite layer versus Cu composition has been achieved and presented here. In addition, optimization of the Cu component of the absorber layer for maximum increase of the response of the detectors as well as its effects on the response characteristics of the devices are presented in this paper. IntroductionSuperconductor transition-edge sensors are one of the most sensitive radiation detectors in the range of infrared to far infrared [1,2]. One of the most effective parameters in the sensitivity of these types of detectors is their surface absorption that determines the efficiency of radiation absorption. Typical transition-edge sensors are implemented by thin layer of high-T c superconductor such as YBCO [3]. But due to weak absorption of YBCO material in the IR range [4], these devices typically do not reach their potentially high detectivity values because a little fraction of input power is absorbed by the device when using the bare YBCO film [5]. Therefore, surface coating is essential for increasing infrared response of these devices, particularly in the micrometer wavelength range.One of the major hinders of using absorber layers for the superconducting ETBs is due to their destructive effects on the electrical properties of the superconducting YBCO material. For example, they can cause lowering of the critical temperature T c or smoothening the transition curve. Smoothening and widening transition curve is an undesirable effect, which reduces peak value in dR/dT curves and hence reducing the IR response [6]. In this work, we introduce a novel absorber, which was coated using a low temperature process and had very little destructive effect on our bolometer device. The absorber, used in this work, is a copper-carbon nano-composite that is coated in a low temperature planar magnetron sputtering process, where we have control over the percentage of copper composition in the deposited absorber layer. As we show in this paper, the absorption coefficient of this film is strongly dependent on Cu composition, leading to the control of the absorption coefficient.

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“…The sensitivity of high-temperature superconducting (HTSC) bolometers can be comparable to the best liquid nitrogen-cooled semiconducting infrared detectors, but with the advantage that the detection range extends to longer wavelengths [1][2][3][4][5]. The traditionally accepted approach to detector design is based on a discrete array of pixel with electronic signal commutation.…”

Section: Introductionmentioning

confidence: 99%