The Role of Multiple Fluctuation Events in NbN and NbTiN Superconducting Nanostrip Single-Photon Detectors

Parlato, L.; Salvoni, Daniela; Ejrnæs, M.; Massarotti, Davide; Caruso, Roberta; Satariano, Roberta; Tafuri, F.; Xiao-yan, Yang; You, Lixing; Wang, Z.; Pepe, Giovanni Piero; Cristiano, R.

doi:10.1007/s10909-020-02395-5

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…As demonstrated in [24], NbRe microstrips can work as single photon detectors at T = 2 K. At this temperature it is reasonable to assume that thermally activated processes are dominating with respect to quantum-mechanical tunneling events, and hence to consider only the former as origin of DCR [12,33,34]. They occur by overcoming an energy barrier U (T, I b ), so that DCR can be expressed through the Boltzmann factor [13]:…”

Section: Theoretical Modelsmentioning

confidence: 99%

Investigation of dark count rate in NbRe microstrips for single photon detection

Ercolano,

Cirillo,

Ejrnaes

et al. 2023

Supercond. Sci. Technol.

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Superconducting microstrip single photon detectors (SMSPDs) received great interest since they are expected to combine the excellent performance of superconducting nanostrip single photon detectors (SNSPDs) with the possibility to cover large active areas using low-cost fabrication techniques. In this work, we fabricated SMSPDs based on NbRe to investigate the role of vortices in the dark counts events in this innovative material and in devices with micrometer size. We realized devices with different layouts, namely single microstrips and pairs of parallel microstrips. The energy barriers related to the motion of single vortices or vortex antivortex pairs, responsible of detection events, have been determined-and compared with the ones of similar devices based on different materials, such as MoSi, WSi and NbN. The analysis confirms the high potential of NbRe for the realization of superconducting single photon detectors with large areas.

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Section: Theoretical Modelsmentioning

confidence: 99%

Investigation of dark count rate in NbRe microstrips for single photon detection

Ercolano,

Cirillo,

Ejrnaes

et al. 2023

Supercond. Sci. Technol.

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“…This behavior can be ascribed to the vortex mechanisms probably responsible of the fluctuation events and then of the dark counts [25][26][27]. Magnetic vortices moving across the width of a superconducting strip, either vortex antivortex pairs (VAP) or as single vortices (SV) overcoming the barrier at opposite edges of the strip, play a relevant role.…”

Section: Measurementsmentioning

confidence: 99%

Investigation of Superconducting Molybdenum Silicide Nanostrips and Microstrips for Single Photon Detectors

et al. 2022

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Superconducting nanostrip single photon detectors have emerged as the highest performing single-photon detectors; however, the possibility to use superconducting microstrip as single photon detectors is very appealing both to use them as larger areas detectors and for an easier technology in the manufacturing. The aim of this work is to test the photoresponse in liquid helium dewar of 9 nm thick MoSi covered with a very thin (2 nm) layer of Al, in two different configurations: nanomeanders and microstrips. We demonstrate that MoSi/Al microstrips can work as photodetectors also at T = 4.2 K. We also compare the dark count rate of the microstrip and the nanowire, confirming the lower noise for the microstrips also at 4.2 K.

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“…Среди различных типов детекторов многие рекордные характеристики принадлежат сверхпроводящим нанопроволочным детекторам (SNSPD). Они обладают высокой эффективностью детектирования и скоростью счета, низкими темновой скоростью счета и временным джиттером в широком диапазоне электромагнитного DOI:10.54503/0002-3035-2022-57.4-580 спектра и при различных рабочих температурах [4][5][6]. Термоэлектрический однофотонный детектор (TSPD) имеет ряд преимуществ по сравнению с SNSPD, в частности, более простую конструкцию чувствительного элемента и менее жесткие требования к рабочей температуре [7,8].…”

Section: Introductionunclassified

Моделирование процессов распространения тепла в пятислойном чувствительном элементе с FeSb2 сенсором после одновременного поглощения нескольких фотонов

Кузанян¹,

Кузанян²,

Никогосян³

et al. 2022

Proceedings of NAS RA. Physics

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Представлены результаты моделирования процессов распространения тепла в пятислойном чувствительном элементе однофотонного термоэлектрического детектора после поглощения нескольких фотонов. Рассмотрено поглощение фотонов в чувствительном элементе с площадью поверхности 10 × 10 мкм2 и различной толщиной просветляющего слоя (SiO2), поглотителя (W), термоэлектрического сенсора (FeSb2), теплоотвода (W) и подложки (Al2O3). Для моделирования процессов передачи тепла использована методика, основанная на уравнении распространения тепла из ограниченного объема. Исследованы случаи одновременного поглощения нескольких фотонов на отрезке длиной 1 мкм на поверхности поглотителя. Показано, что можно определить число поглощенных фотонов вплоть до 8. The results of modelling of heat propagation processes in the five-layer detection pixel of a thermoelectric single-photon detector after absorption of more than one photon are presented. We have considered the absorption of photons in the detection pixel with a surface area of 10 × 10 μm2 and various thicknesses of the antireflection layer (SiO2), absorber (W), thermoelectric sensor (FeSb2), heat sink (W), and substrate (Al2O3). To simulate of heat transfer processes the technique based on the equation of heat propagation from a limited volume is used. The cases of simultaneous absorption of several photons at a length of 1 μm of the absorber surface are investigated. It is shown that the number of absorbed photons up to 8 can be determined.

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The Role of Multiple Fluctuation Events in NbN and NbTiN Superconducting Nanostrip Single-Photon Detectors

Cited by 12 publications

References 14 publications

Investigation of dark count rate in NbRe microstrips for single photon detection

Investigation of dark count rate in NbRe microstrips for single photon detection

Investigation of Superconducting Molybdenum Silicide Nanostrips and Microstrips for Single Photon Detectors

Моделирование процессов распространения тепла в пятислойном чувствительном элементе с FeSb2 сенсором после одновременного поглощения нескольких фотонов

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