High-temperature superconductor bolometers for the IR region

Khrebtov, I. A.; Tkachenko, A. D.

doi:10.1364/jot.66.000735

Cited by 11 publications

(25 citation statements)

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“…Three basic types of superconductor bolometric detectors have been introduced and studied: on a solid substrate, the bolometers on thermal filament and the membrane version. The reported measurements indicate that the free-membrane type exhibits more sensitivity among these three basic types of bolometric detectors [1]. The steady-state voltage optical responsivity of a bolometer is calculated previously [2].…”

Section: Introductionmentioning

confidence: 92%

“…The thermal conductance and heat capacitance of the substrate are (1) where is the thermal conductivity, is the specific heat per unit volume, and is the area of the substrate [2]. Equation (1) is valid when the substrate thickness and the lateral distance between the device area and the cold head is less than the thermal diffusion length of the substrate, .…”

Section: Theoretical Modelmentioning

confidence: 99%

“…To evaluate the 3-D internal energy per unit volume , the same strategy approached above leads to [3] (5) 1 Note that (4) and (5) were mistakenly written in [3]. …”

Section: Theoretical Modelmentioning

confidence: 99%

“…Experimental and theoretical analysis [1], [3] show that using the thinner substrates in the free-membrane bolometers would decrease the heat capacitance and the thermal conductance which improve the sensitivity. According to the previous Manuscript reports, decreasing the substrate thickness would increase the heat conductivity in the micrometer range of thickness [4], [5] and would decrease the heat conductivity in the range of hundreds of nanometers [6] through two different mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Substrate Thickness on Responsivity of Free-Membrane Bolometric Detectors

et al. 2011

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The effect of substrate thickness and its Debye temperature on the bolometric response of the freestanding-membrane type of superconductor transition-edge detectors is investigated. The investigation is based on the calculation of the variation of the specific heat per unit volume and the heat conductivity using the finite-size scaling method for different Debye temperatures and micron size thickness of substrate. We also calculated the heat capacity and time constant for various materials with Debye temperatures in the range of 600-1400 K. The calculated results are compared with previously reported response values obtained theoretically and experimentally for the thermal-based infrared (IR) detectors. The IR response versus substrate thickness of these types of devices for different modulation frequencies is also presented. This inspected response at low thicknesses of substrate shows anomalistic behavior with respect to the previously reported results of response analyses. Here, we also obtained the optimized substrate thickness and Debye temperatures for maximum responsivity of these types of devices.Index Terms-Finite size effect, responsivity, superconductor bolometer.

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Section: Introductionmentioning

confidence: 92%

Section: Theoretical Modelmentioning

confidence: 99%

“…To evaluate the 3-D internal energy per unit volume , the same strategy approached above leads to [3] (5) 1 Note that (4) and (5) were mistakenly written in [3]. …”

Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Substrate Thickness on Responsivity of Free-Membrane Bolometric Detectors

et al. 2011

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“…The total NEP for a high-temperature superconductor bolometer is obtained as follows [8], [15], [26]: By considering (4) and (5), the dependence of responsivity versus chopping frequency can be obtained through (2) [19]. Substituting (6) using the result of (2) into (1), the spectrum of the detectivity of the device versus chopping is calculated.…”

Section: Theoretical Modelmentioning

confidence: 99%

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Moftakharzadeh

Kokabi

Bozbey

et al. 2009

IEEE Trans. Appl. Supercond.

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Bolometric response and noise characteristics of YBCO superconductor transition edge IR detectors with relatively sharp transition and its resulting detectivity are investigated both theoretically and experimentally. The magnitude of response of a fabricated device was obtained for different bias currents and modulation frequencies. Using the measured and calculated bolometric response and noise characteristics, we found and analyzed the device detectivity versus frequency for different bias currents. The detectivity versus chopping frequency of the device did not decrease following the response strongly, due to the decrease of the noise at higher frequencies up to 1 kHz, resulting in maximum detectivity around the modulation frequency of 100 Hz. We also improved the responsivity of the device through the increase of the surface absorption by using a novel infrared absorber, which is made of a copper-carbon composite, coated in a low-temperature process. Within the modulation frequency range studied in this paper, comparison of device detectivity before and after coating is also presented.Index Terms-Detectivity, infrared absorber, transition edge sensor (TES).

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Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

Brock,

Østergaard,

Wulff

et al. 2023

Adv Elect Materials

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Many applications require monitoring of increasingly high neutron flux levels. Pre‐neutron characterization is performed of a superconducting transition edge bolometric device, sensitive to neutrons by an enriched boron carbide (10B4C) layer. Heat from the absorption of neutrons is simulated using an attenuated laser, while the detector is cooled to the critical temperature, Tc. Frequency dependent (4–25 Hz) and constant input power measurements are performed on a 10B4C‐coated and a non‐coated pixel. Results are used to fit a two lumped element thermal model. The effective specific heat is highly dependent on the input pulse duration due to the interconnected stack structure. For modulated pulses, the active volume in the thermal circuit is the full depth of the substrate in the area under the pixel. For constant power input, a large portion of the substrate is heated and the interface conductivities to the cold finger are found to be important. The detectivity is D* = 3.5 × 108 , and is only slightly lower than similar detectors. Understanding the dynamics of the detector better and using neutron excitation, it is expected that optimizations can lead to an equally good detector for cold to thermal neutrons at flux levels >106 n cm−2s−1.

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High-temperature superconductor bolometers for the IR region

Cited by 11 publications

References 0 publications

Effect of Substrate Thickness on Responsivity of Free-Membrane Bolometric Detectors

Effect of Substrate Thickness on Responsivity of Free-Membrane Bolometric Detectors

Investigation of Bias Current and Modulation Frequency Dependences of Detectivity of YBCO TES and the Effects of Coating of Cu–C Composite Absorber Layer

Effective Thermal Properties of a HTS Transition Edge Bolometer for High‐Flux Neutron Detection

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