Nonlinearity and electrothermal feedback of high Tc transition edge bolometers

Neff, H.; Lima, A.M.N.; Deep, G.S.; Freire, R.C.S.; Melcher, Elmar U. K.; Khrebtov, I. A.; Tkachenko, A. D.

doi:10.1063/1.125844

Cited by 12 publications

(10 citation statements)

References 6 publications

(8 reference statements)

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“…This electrothermal feedback was described previously by Kohl et al [15], highlighting its consequences on the sensitivity and noise of metal film resistance bolometers. The same phenomenon was observed earlier in bolometers based on superconductor materials [16].…”

Section: Introductionsupporting

confidence: 86%

“…This electrothermal feedback effect was described in previous works on bolometers [15,16], where the interest was mainly to model the effects on the device sensitivity. The feedback was also considered for its effect on thermal noise, and the authors simply propose to calculate the voltage noise power density as 4k B T Re ðrÞ, where "Re ðrÞ" indicates the real part of impedance r. This approach was demonstrated to be applicable to RLC (resistance, inductance, and capacitance) networks in thermal equilibrium, but there is no physical justification for use of it for out-of-equilibrium systems in the presence of electrothermal feedback.…”

Section: (B)mentioning

confidence: 99%

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Thermal Noise-Boosting Effects in Hot-Wire-Based Micro Sensors

et al. 2020

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This article proposes an original approach aimed at modelling the noise density in sensors based on a single hot wire or pairs of thermally coupled wires. The model consists in an original combination of a previous electrothermal model of the wire with well-established assumptions on the thermal noise in conductors that carry moderate current densities. A simple method for estimating the model parameters with simple impedance spectroscopy is suggested. The predicted power spectral densities of the wire thermal noise differ from the result of previously presented analytical models, stimulating further experimental studies. The effects of the electrothermal feedback of both hot wires and hot-wire pairs on flicker noise is also intrinsically covered by the proposed approach.

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Section: Introductionsupporting

confidence: 86%

Section: (B)mentioning

confidence: 99%

Thermal Noise-Boosting Effects in Hot-Wire-Based Micro Sensors

et al. 2020

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“…The performance of cooled microbolometers, operating slightly above the boiling point of liquid nitrogen, now nearly matches that of quantum detectors, 1,2 particularly at wavelengths Ͼ10 m. Uncooled microbolometers, operating at room temperature, as are investigated in this work, typically reveal a reduced performance in the FIR wavelength region, as compared to devices operating at low temperatures. However, the achievable sensitivity D* of state of the art uncooled microbolometers can now be considered to be superior to that of FIR-CMT quantum detectors, when operated at room temperature.…”

Section: Introductionmentioning

confidence: 57%

Stability conditions, nonlinear dynamics, and thermal runaway in microbolometers

Brandão

Almeida

Deep

et al. 2001

Journal of Applied Physics

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The nonlinear dynamic behavior of microbolometers, operating at room temperature (300 K) under conditions of positive electrothermal feedback is investigated. An improved device model, based on the heat balance equation is developed. It takes into account the temperature dependence of the thermophysical parameters, such as thermal coupling coefficient between the sensor and its surroundings, and sensor heat capacity and its thermal resistance coefficient. Operational considerations for thermoresistive microbolometer with positive and negative temperature coefficient of resistance are discussed for both, constant current and constant voltage modes of operation. Analytical expressions are derived for predicting stable and unstable operation. Safety factors L0, establishing the biasing conditions for stable device operation are proposed for the positive temperature coefficient of resistance and negative temperature coefficient of resistance type sensors. Limits for fast catastrophic destruction are provided, and the dynamic characteristics of the associated thermal runaway phenomenon is illustrated. This effect, as predicted by analysis and numerical simulation, was observed experimentally, confirming the validity of the proposed modeling approach for the microbolometer.

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“…The theoretical estimation of the influence of the different noise components on the noise equivalent power (NEP) and the detectivity (D*) of bolometers, operating in constant current mode (CCM) with positive ETF and CVM with negative passive ETF and active ETF at various G b , T b , R b , noise Hooge parameters D H of YBaCuO films, substrate materials, area size was carried out. The results of estimation, using the theory developed in [4][5][6]8,9], are shown in Table 1 and on Figures 1,2.…”

Section: Estimation Of Radiometer Noise Performance For Various Modesmentioning

confidence: 99%

“…Nevertheless, the heat mechanism of bolometer operation allows one to solve this problem using electrothermal feedback (ETF) as in passive as in active modes [3][4][5][6][7]. The efficiency of the bolometer operating in constant voltage mode (CVM) with use of negative electrothermal feedback ETF is due to the loop gain L 0 =P b E/G b , here: P b is Joule power, E is the temperature coefficient of resistance, G b is the thermal conductance.…”

Section: Introductionmentioning

confidence: 99%