&lt;title&gt;Noise of high-Tc superconducting bolometers&lt;/title&gt;

Khrebtov, I. A.; Leonov, Vladimir; Tkachenko, A. D.; Bratukhin, P. V.; Иванов, А. А.; Кузнецов, А. В.; Neff, H.; Steinbeiß, E.

doi:10.1117/12.304492

Cited by 5 publications

(2 citation statements)

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“…The NEP e values are governed by the phonon noise determined by the second term in equation (1), NEP e = (4kT 2 G) 1/2 = (1.5−5.8) × 10 −12 W Hz −1/2 . The high quality of superconducting films, which manifests itself by low excess 1/f noise (low Hooge-parameter of ∼10 −4 near T c ) at very small dimensions of the microbolometer element, allowed NEP e to be improved by almost an order of magnitude compared with that of antenna YBCO microbolometers on NdGaO substrate [4].…”

Section: Test Of the Antenna Coupled Microbolometersmentioning

confidence: 99%

“…Later, detectors of this kind based on films of high-temperature superconductors (HTS) were developed [2,3]. The NEP of an HTS film microbolometer is mainly limited by an excess low-frequency noise in the current flowing through the HTS film (1/f , or flicker noise), as well as by a phonon noise due to random energy exchange between the film and substrate [4].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication process and noise properties of antenna-coupled microbolometers based on superconducting YBCO films

Karmanenko

Семенов

Khrebtov

et al. 2000

Supercond. Sci. Technol.

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An analysis of how the detectivity and lifetime depend on the fabrication process of superconducting antenna-coupled microbolometers has been carried out. The temperature dependences of responsivity and noise equivalent power (NEP) have been estimated in terms of the thermal model. To reveal the main degradation mechanism, 1/f-noise characterization has been used. Monte-Carlo simulation of the annealing procedure of YBa 2 Cu 3 O 7 (YBCO) films for the operating ranges of frequency and temperature has shown that prevailing sources of flicker noise in superconducting microstrips are associated with transitions of oxygen atoms situated close to low-angle boundaries of the film blocks. The magnetron sputtering technique has been optimized to reduce the Hooge parameter for flicker noise to a record-breaking low value for YBCO films of about 10 −4 at 93 K. Comparative analysis of chemical, ion and laser etching techniques by low-temperature scanning electron microscopy and magneto-optics allowed the fabrication of microstrips with uniform current distribution characterized by critical current density higher than 10 6 A cm −2 at 77 K and long-time stability. The process of low-energy ion milling of YBCO films with an Ar + beam generated in a duopigatron ion source was used to reach a width resolution at the topology edge better than 0.2 µm. The antenna-coupled bolometers fabricated from the superconducting microstrips were used to register microwave radiation at a frequency of 70.3 GHz and temperature of 93 K. It is demonstrated that the developed technology makes possible the fabrication of long-lived YBCO-based antenna microbolometers with electrical NEP e = 1.5 × 10 −12 W Hz −1/2. The calculated response time of the antenna is about 30-150 ns. Further development is associated with fabrication of coupling microbolometers with immersed lens, with predicted optical detectivity D * = (4 × 10 9 −4 × 10 10) cm Hz 1/2 W −1 in the wavelength range 100-1000 µm.

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Section: Test Of the Antenna Coupled Microbolometersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication process and noise properties of antenna-coupled microbolometers based on superconducting YBCO films

Karmanenko

Семенов

Khrebtov

et al. 2000

Supercond. Sci. Technol.

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Highly Responsive Y–Ba–Cu–O Thin Film THz Detectors With Picosecond Time Resolution

Thoma

Raasch

Scheuring

et al. 2013

IEEE Trans. Appl. Supercond.

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High-temperature superconducting YBa 2 Cu 3 O 7-δ δ δ δ (YBCO) thin-film detectors with improved responsivities were developed for fast time-domain measurements in the THz frequency range. YBCO thin films of ≈ 30 nm thickness were patterned to micro-and nanobridges and embedded into planar log-spiral THz antennas. The YBCO thin-film detectors were characterized with continuous wave radiation at 0.65 THz. Responsivity values as high as 710 V/W were found for the YBCO nanobridges. Pulsed measurements in the THz frequency range were performed at the electron storage ring ANKA from the Karlsruhe Institute of Technology (KIT). Due to the high responsivities of the nanobridges no biasing was required for the detection of the coherent synchrotron radiation pulses achieving very good agreement between the measured pulse shapes and simulations.

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