Towards Ultra-Low-Noise MoAu Transition Edge Sensors

Goldie, D. J.; Velichko, A. V.; Glowacka, D.; Withington, S.

doi:10.1007/s10909-012-0575-x

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…7 and 8 are given in Table III. We see that α is low compared to our MoAu TESs, where β 0:05α, 28 and the responsivity is reduced from the high-α value k s ¼ 1. The FIG.…”

Section: Journal Of Applied Physicscontrasting

confidence: 54%

First characterization of a superconducting filter-bank spectrometer for hyper-spectral microwave atmospheric sounding with transition edge sensor readout

Goldie

Thomas

Withington

et al. 2020

Journal of Applied Physics

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“…7 and 8 are given in Table III. We see that α is low compared to our MoAu TESs, where β 0:05α, 28 and the responsivity is reduced from the high-α value k s ¼ 1. The FIG.…”

Section: Journal Of Applied Physicscontrasting

confidence: 54%

First characterization of a superconducting filter-bank spectrometer for hyper-spectral microwave atmospheric sounding with transition edge sensor readout

Goldie

Thomas

Withington

et al. 2020

Journal of Applied Physics

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“…Noise-equivalent powers (NEPs) as low as 0.5 aW Hz −1/2 are now routinely achieved [2][3][4][5][6][7] . Our own ultra-low-noise TESs, developed for the SAFARI instrument on SPICA 8,9 , have four SiN x support legs, 200 nm thick, 2.1 µm wide and 540 µm long, giving a total thermal conductance G of 0.19 pW K −1 and an NEP of 0.42 aW Hz −1/2 . The usual approach to describing heat flow in the legs is to use P (T h , T c ) = K(T n h − T n c ), where T h and T c are the hot and cold termination temperatures respectively.…”

Section: Introductionmentioning

confidence: 99%

Transition edge sensors with few-mode ballistic thermal isolation

Osman¹,

Withington²,

Goldie³

et al. 2014

Journal of Applied Physics

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We have fabricated Transition Edge Sensors (TESs) whose thermal characteristics are completely characterised by few-mode ballistic phonon exchange with the heat bath. These TESs have extremely small amorphous SiN x support legs: 0.2 µm thick, 0.7 to 1.0 µm wide and 1.0 to 4.0 µm long. We show, using classical elastic wave theory, that it is only necessary to know the geometry and bulk elastic constants of the material to calculate the thermal conductance and fluctuation noise. Our devices operate in the few-mode regime, between 5 and 7 modes per leg, and have noise equivalent powers (NEPs) of 1.2 aW Hz −1/2 . The NEP is dominated by the thermal fluctuation noise in the legs, which itself is dominated by phonon shot-noise. Thus TESs have been demonstrated whose thermal characteristics are fully accounted for by an elastic noise-wave model. Our current devices, and second-generation devices based on patterned phononic filters, can be used to produce optically compact, mechanically robust, highly sensitive TES imaging arrays, circumventing many of the problems inherent in conventional long-legged designs.

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“…The SiO 2 also contributes heat capacity and hence possibly additional noise features. MoAu TESs do not require passivation and our initial devices reported elsewhere in these proceedings 9 have demonstrated excellent long-term stability. √ Hz for a conductance to the bath G b = 0.17 pW/K is within a factor of order √ 2 of the phonon limit calculated with noise modifier γ φ = 0.5.…”

Section: Psfrag Replacementsmentioning

confidence: 91%

“…The SiO 2 also contributes heat capacity and hence possibly additional noise features. MoAu TESs do not require passivation and our initial devices reported elsewhere in these proceedings [9] have demonstrated excellent long-term stability. Figure 1(b) shows the measured dark NEP for two of these TESs.…”

Section: Introductionmentioning

confidence: 91%

A Fabrication Route for Arrays of Ultra-low-Noise MoAu Transition Edge Sensors on Thin Silicon Nitride for Space Applications

et al. 2012

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We describe a process route to fabricate arrays of Ultra-low-Noise MoAu Transition Edge Sensors (TESs). The low thermal conductance required for space applications is achieved using 200 nm-thick Silicon Nitride (SiN x ) patterned to form long-thin legs with widths of 2.1 µm. Using bilayers formed on SiN x islands from films with 40 nm-thick Mo and Au thicknesses in the range 30 to 280 nm deposited by dc-sputtering in ultra-high vacuum we can obtain tunable transition temperatures in the range 700 to 70 mK. The sensors use large-area absorbers fabricated from high resistivity, thin-film β-phase Ta to provide impedance-matching to incident radiation. The absorbers are patterned to reduce the heat capacity associated with the nitride support structure and include Au thermalizing features to assist the heat flow into the TES. Arrays of 400 detectors at the pixel spacing required for the long-wavelength band of the far-infrared instrument SAFARI are now being fabricated. Device yields approaching 99% are achieved.

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Towards Ultra-Low-Noise MoAu Transition Edge Sensors

Cited by 5 publications

References 7 publications

First characterization of a superconducting filter-bank spectrometer for hyper-spectral microwave atmospheric sounding with transition edge sensor readout

First characterization of a superconducting filter-bank spectrometer for hyper-spectral microwave atmospheric sounding with transition edge sensor readout

Transition edge sensors with few-mode ballistic thermal isolation

A Fabrication Route for Arrays of Ultra-low-Noise MoAu Transition Edge Sensors on Thin Silicon Nitride for Space Applications

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