Complex impedance, responsivity and noise of transition-edge sensors: Analytical solutions for two- and three-block thermal models

Maasilta, I. J.

doi:10.1063/1.4759111

Cited by 42 publications

(43 citation statements)

References 32 publications

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“…This has also practical relevance, because heat capacity is an important variable in bolometric detectors, as their noise properties depend sensitively on the heat capacities of different parts of the device. 24,25 Moreover, in the calorimetric (energy resolving) mode, the energy resolution is strongly dependent on the heat capacity. 26 In this work we calculate the heat capacities for two common membrane materials used in low temperature devices, silicon and silicon nitride, and compare how PnC patterns of different periodicity and membrane thickness affect the heat capacity.…”

Section: Introductionmentioning

confidence: 99%

Low temperature heat capacity of phononic crystal membranes

Puurtinen

Maasilta

2016

AIP Advances

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Phononic crystal (PnC) membranes are a promising solution to improve sensitivity of bolometric sensor devices operating at low temperatures. Previous work has concentrated only on tuning thermal conductance, but significant changes to the heat capacity are also expected due to the modification of the phonon modes. Here, we calculate the area-specific heat capacity for thin (37.5 - 300 nm) silicon and silicon nitride PnC membranes with cylindrical hole patterns of varying period, in the temperature range 1 - 350 mK. We compare the results to two- and three-dimensional Debye models, as the 3D Debye model is known to give an accurate estimate for the low-temperature heat capacity of a bulk sample. We found that thin PnC membranes do not obey the 3D Debye T3 law, nor the 2D T2 law, but have a weaker, approximately linear temperature dependence in the low temperature limit. We also found that depending on the design, the PnC patterning can either enhance or reduce the heat capacity compared to an unpatterned membrane of the same thickness. At temperatures below ∼ 100 mK, reducing the membrane thickness unintuitively increases the heat capacity for all samples studied. These observations can have significance when designing calorimetric detectors, as heat capacity is a critical parameter for the speed and sensitivity of a device.

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Section: Introductionmentioning

confidence: 99%

Low temperature heat capacity of phononic crystal membranes

Puurtinen

Maasilta

2016

AIP Advances

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“…More complex models with additional thermal blocks are required, as reported in other works [26]- [31]. The simplest extension (two thermal blocks) assumes an extra C coming either from the membrane or from the decoupling of the electrons and phonons in the TES; both cases may result in quite similar Z(), also nearly indistinguishable from the SBM fits [28]. Three block models will be considered to better reproduce the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Development of Cryogenic X-Ray Detectors Based on Mo/Au Transition Edge Sensors

Pobes

Fàbrega

Camón

et al. 2017

IEEE Trans. Appl. Supercond.

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Abstract-We report on the development of Mo/Au based Transition Edge Sensors (TESs) aimed at soft X-ray detection. TESs of different sizes with T c~1 00 mK and very narrow transitions have been fabricated. Dark characterization based on I-V, complex impedance and noise measurements has allowed us to obtain their basic functional parameters at different bath temperatures and operating points. Electrodeposited Bi films, to be used as X-ray absorbers, have been developed and characterized.  Index Terms-Transition Edge Sensors, X-ray spectroscopy, proximity effect, radiation detectors

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“…The data are from MXW4647 (3-finger, on membrane), taken at T Base = 97.6 mK with different values of I Bias . The model fit is based on a two-block thermal model with separate connections to the thermal bath ("parallel" model in reference [13]). Squares in the center and right plots mark the bias point where the complex admittance data shown in the left panel was acquired.…”

Section: Discussionmentioning

confidence: 99%

Mapping TES Temperature Sensitivity and Current Sensitivity as a Function of Temperature, Current, and Magnetic Field with IV Curve and Complex Admittance Measurements

et al. 2018

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We have specialized astronomical applications for X-ray microcalorimeters with superconducting transition edge sensors (TESs) that require exceptionally good TES performance, but which operate in the small-signal regime. We have therefore begun a program to carefully characterize the entire transition surface of TESs with and without the usual zebra stripes to see if there are reproducible local "sweet spots" where the performance is much better than average. These measurements require precise knowledge of the circuit parameters. Here, we show how the Shapiro effect can be used to precisely calibrate the value of the shunt-resistor. We are also investigating the effects of stress and external magnetic fields to better understand reproducibility problems.

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Complex impedance, responsivity and noise of transition-edge sensors: Analytical solutions for two- and three-block thermal models

Cited by 42 publications

References 32 publications

Low temperature heat capacity of phononic crystal membranes

Low temperature heat capacity of phononic crystal membranes

Development of Cryogenic X-Ray Detectors Based on Mo/Au Transition Edge Sensors

Mapping TES Temperature Sensitivity and Current Sensitivity as a Function of Temperature, Current, and Magnetic Field with IV Curve and Complex Admittance Measurements

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