Photon Number Resolution with an Iridium Optical Transition Edge Sensor at a Telecommunication Wavelength

Mitsuya, Yuki; Konno, Toshio; Takasu, Sachiko; Hattori, K.; Ohno, Masashi; Fukuda, Daiji; Takahashi, Hiroyuki

doi:10.1007/s10909-022-02928-0

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The higher the critical temperature T C of the base material, the thicker the layer of a normal metal is needed to suppress T C to the required values by the proximity effect. In this regard, the latest TES generations for operating temperatures of 30 to 50 mK are based on such materials as tungsten and iridium [ 8 , 9 , 10 ]. The values of their critical temperatures, 15 mK and 112 mK, respectively, are the closest to the required ones [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The iridium critical temperature can also be suppressed by the proximity effect [ 9 , 12 , 16 , 17 ]. But iridium is more expensive compared to hafnium, and the iridium technology is more complicated since it requires substrate heating and magnetron sputtering [ 8 , 10 ]. While tungsten has a critical temperature close to 15 mK [ 18 ], it has its drawbacks, such as several crystal modifications that can turn into each other during thermal cycles [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Safonova,

Gordeeva,

Blagodatkin

et al. 2023

Materials

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Hafnium is a superconductor with a transition temperature slightly above 100 mK. This makes it attractive for such applications as microcalorimeters with high energy resolution. We report the superconducting properties of Hf films of thicknesses ranging from 60 to 115 nm, deposited on Si and Al2O3 substrates by electron beam evaporation. Besides that, we fabricated and measured combinations of hafnium with thin layers of normal metals, decreasing the critical temperature by the proximity effect. The critical temperature of the studied films varied from 56 to 302 mK. We have observed a significant change in the critical temperature of some films over time, which we propose to prevent by covering hafnium films with a thin layer of titanium.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Safonova,

Gordeeva,

Blagodatkin

et al. 2023

Materials

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“…A superconductor such as iridium can also be used to accomplish the tasks set [10][11][12]. Iridium has superconducting properties close to hafnium; its critical temperature is 112 mK [10].…”

Section: Introductionmentioning

confidence: 99%

“…But there are difficulties with depositing iridium to the substrate; it is a more refractory and dense metal than hafnium. Therefore, it requires a magnetron sputtering machine and a heating of a substrate [10,12]. In addition, iridium is much more expensive compared to hafnium.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Safonova,

Gordeeva,

Blagodatkin

et al. 2023

Preprint

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Hafnium is a metal with rare properties, such as a low superconducting transition temperature slightly above 100 mK, which makes it attractive for a lot of applications, especially for design and fabrication of microcalorimeters with high energy resolution. In this paper we describe the results of fabrication and experimental investigation of superconducting properties of hafnium thin films in a dilution refrigerator. The considered Hf films, whose thickness is in the range from 60 to 115 nm, are deposited on substrates by electron beam evaporation. The combinations with thin layers of normal metals to decrease the critical temperature of superconducting hafnium films by proximity effect, are also considered. The critical temperature of the studied films varies from 56 to 302 mK. Also, significant increase of the critical temperature of some films over time was observed and investigated.

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Single and few-photon detection using superconducting transition edge sensors

Fukuda,

Kikuchi

2024

Progress in Optics

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Photon Number Resolution with an Iridium Optical Transition Edge Sensor at a Telecommunication Wavelength

Cited by 6 publications

References 15 publications

Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Investigation of Hafnium Thin Films for Design of TES Microcalorimeters

Single and few-photon detection using superconducting transition edge sensors

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