High sensitivity high T<sub>c</sub> superconducting Josephson junction antenna for 200 GHz detection

Holdengreber, Eldad; Moshe, Aviv Glezer; Mizrahi, Moshe; Khavkin, V.; Schacham, S. E.; Farber, E.

doi:10.1080/09205071.2018.1535333

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…The Shapiro step at 0.31 mV is due to the presence of electromagnetic radiation at~148 GHz. These results are clearly superior to typical NEP and η(V) values reported for sensitive detection systems at 60 K, namely around 1 × 10 −12 W•Hz −1/2 and 10 kV•W −1 , respectively [13,25,42]. Once again, the high peak at 148 GHz in the dI/dV characteristics (bottom curve Figure 15) demonstrates the high agreement between simulation and experimental results.…”

Section: Measurement Resultsmentioning

confidence: 51%

“…The performance of the detection systems is analyzed by electromagnetic simulations, carried out using High-Frequency Structure Simulator (HFSS) software by ANSYS. We begin with the analysis of the conventional design, in which the Josephson junction is placed in the gap between the two poles of the antenna [12,25]. Optimal results were obtained for a pole width of 115.5 µm and a length of 144.3 µm, with a separation between the two antenna poles, a gap width, of a 4.2 µm.…”

Section: Antenna Optimizationmentioning

confidence: 99%

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THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

et al. 2020

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Superconducting Josephson junctions have major advantages as detectors of millimeter wave radiation. Frequency of the radiation can be easily derived from the Shapiro steps of the current-voltage characteristics. However, system performance is highly sensitive to impedance mismatch between the antenna and the junction; therefore, optimization is essential. We analyzed and implemented an improved antenna structure, in which the junction is displaced from the antenna center and placed between the ends of two matching strips. Based on theoretical analysis and advanced electromagnetic simulations, we optimized strip dimensions, which affect both the detection magnitude and the frequency of the reflection coefficient dip. Accordingly, two Au bow-tie antennas with different matching strip widths were fabricated. Superconducting Yttrium Barium Copper Oxide (YBCO) thin films were deposited exactly at the bicrystal substrate misorientation points, forming Josephson junctions at the ends of two matching strips. We found a very high correlation between the simulations and the response to Radio Frequency (RF) radiation in the range of 145–165 GHz. Experimental results agree extremely well with the design, showing best performance of both antennas around the frequency for which impedance matching was derived.

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Section: Measurement Resultsmentioning

confidence: 51%

Section: Antenna Optimizationmentioning

confidence: 99%

THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

et al. 2020

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“…The waveguide antenna is cost-effective and avoids power scattering in the substrate [15]. Holdengreber et al presented another antenna system based on a Josephson junction as a detecting element for 0.20-THz detection [16,17]. They demonstrated high sensitivity detection without coupling lenses [16].…”

Section: Introductionmentioning

confidence: 99%

“…Holdengreber et al presented another antenna system based on a Josephson junction as a detecting element for 0.20-THz detection [16,17]. They demonstrated high sensitivity detection without coupling lenses [16]. A significant work has been done in the direction of improving coupling between the THz sources and waveguides but still progressively increasing THz applications [1][2][3][4][5], and THz components, like planar dielectric waveguides, demand further improvement.…”

Section: Introductionmentioning

confidence: 99%

Vivaldi End-Fire Antenna for THz Photomixers

Abdullah

Mukherjee

Kumar

et al. 2020

J Infrared Milli Terahz Waves

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We propose a broadband end-fire antenna for continuous-wave terahertz (THz) photomixing-based devices working in the frequency range of 0.5-1 THz. A compact Vivaldi antenna is presented that does not require any hyper-hemispherical silicon lens to collect and collimate THz radiation unlike the conventionally used broadside antennas. The antenna is tailored to radiate THz into or receive radiation from a dielectric waveguide placed in close vicinity of it. The antenna is fabricated on an indium phosphide (InP) substrate. A silicon (Si) superstrate is used to improve the directionality of the radiated beam. THz power coupled into Si waveguides is measured using two different techniques between 0.1 and 1.15 THz. Firstly, the waveguide is placed in the optical path of a 1550 nm based continuous-wave THz setup with a commercial broadside emitter, focusing optics, and a detector fabricated on the InP substrate with log-periodic broadside antenna. Secondly, the waveguide is placed in direct contact with the designed Vivaldi antenna-based THz receiver and using the commercial broadside emitter as a source. It is observed that the direct coupling technique using the Vivaldi end-fire antenna outperforms the optically coupled approach at frequencies higher than 668 GHz. Efficient THz photoconductive sources and receivers based on the designed compact Vivaldi end-fire antenna will be suitable for launching THz power into on-chip THz circuitry and for compact THz systems.

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“…Previous research proved generation of THz radiation and charge density waves in this region, which can play an important role in some technological applications. Particularly, high sensitivity detectors for THz and hundreds of GHz electromagnetic waves imagining have been designed recently [22,23].…”

Section: Introductionmentioning

confidence: 99%

Charging of Superconducting Layers in Arrays of Coupled Josephson Junctions for Overcritical Currents

Cuzminschi

Zubarev

2019

Crystals

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In this work, we effectuated the numerical simulations of the phase dynamics of an array of Josephson junctions taking into account the capacitive coupling between the neighboring junctions and the diffusion current in the stack. We observed that, if we increase the coupling and the dissipation parameters, the IV characteristic changes qualitatively from the IV characteristics studied before. For currents greater than the critical one, we obtained an additional branch in the IV characteristics. This branch is characterized by a lower voltage than the outermost one. Moreover, we obtained an additional charging of the superconducting layers in the IV region for currents greater than the critical one. We studied the time evolution of this charging by the means of Fast Fourier Transform. We proved that the charge density wave associated with this charging has a complex spectral structure. In addition, we analyzed the behavior of the system for different boundary conditions, appropriate to different experimental setups.

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High sensitivity high T_c superconducting Josephson junction antenna for 200 GHz detection

Cited by 19 publications

References 26 publications

THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

Vivaldi End-Fire Antenna for THz Photomixers

Charging of Superconducting Layers in Arrays of Coupled Josephson Junctions for Overcritical Currents

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High sensitivity high Tc superconducting Josephson junction antenna for 200 GHz detection

Cited by 19 publications

References 26 publications

THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

THz Radiation Measurement with HTSC Josephson Junction Detector Matched to Planar Antenna

Vivaldi End-Fire Antenna for THz Photomixers

Charging of Superconducting Layers in Arrays of Coupled Josephson Junctions for Overcritical Currents

Contact Info

Product

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High sensitivity high T_c superconducting Josephson junction antenna for 200 GHz detection