Details
| Original language | English |
|---|---|
| Article number | 1800705 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 33 |
| Issue number | 5 |
| Early online date | 28 Feb 2023 |
| Publication status | Published - Aug 2023 |
| Externally published | Yes |
Abstract
Josephson junctions from high-temperature superconductors allow the characterization of frequency and power of high-frequency electromagnetic radiation in the THz range by evaluation of their current-voltage characteristic. This feature makes a Josephson junction suitable to be used as a sensor for the mapping of near and far-field distributions. The sensitivity of such a so-called Josephson cantilever is improved by using antennas to couple the radiation to the Josephson junction. In this work, the Josephson cantilever is fabricated with epitaxial yttrium barium copper oxide (YBa2Cu3O7) on a magnesium oxide (MgO) bicrystal substrate. A model for the surface impedance of YBa2Cu3O7 in the THz regime is presented, which is required for highly efficient antenna designs. This model depends, among other properties, on the quality and thickness of the thin film. Also, the sensitivity of the Josephson cantilever is strongly dependent on the gain of the antenna and the impedance mismatch of the Josephson junction to the antenna's feed point. This work investigates suitable antenna designs for the coupling of 1.4, THz radiation to Josephson junctions, whilst considering the low Josephson junction impedance and the electrical properties of the YBa2Cu3O7 and substrate.
Keywords
- Impedance, Josephson junctions, Surface impedance, Substrates, Mathematical models, Antenna measurements, Antenna feeds, THz microscope, Josephson cantilever, HTS, YBCO, antennas, simulation, CST Studio
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Transactions on Applied Superconductivity, Vol. 33, No. 5, 1800705, 08.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Antenna Designs for Efficient Coupling to Josephson Junctions for THz Microscopy
AU - Ritter, Paul Julius
AU - Stapelfeldt, Finn-Niclas
AU - Tollkühn, Marco
AU - Hanisch, Dominik
AU - Pröpper, Max
AU - Schilling, Meinhard
AU - Hampel, Benedikt
N1 - Publisher Copyright: © 2002-2011 IEEE.
PY - 2023/8
Y1 - 2023/8
N2 - Josephson junctions from high-temperature superconductors allow the characterization of frequency and power of high-frequency electromagnetic radiation in the THz range by evaluation of their current-voltage characteristic. This feature makes a Josephson junction suitable to be used as a sensor for the mapping of near and far-field distributions. The sensitivity of such a so-called Josephson cantilever is improved by using antennas to couple the radiation to the Josephson junction. In this work, the Josephson cantilever is fabricated with epitaxial yttrium barium copper oxide (YBa2Cu3O7) on a magnesium oxide (MgO) bicrystal substrate. A model for the surface impedance of YBa2Cu3O7 in the THz regime is presented, which is required for highly efficient antenna designs. This model depends, among other properties, on the quality and thickness of the thin film. Also, the sensitivity of the Josephson cantilever is strongly dependent on the gain of the antenna and the impedance mismatch of the Josephson junction to the antenna's feed point. This work investigates suitable antenna designs for the coupling of 1.4, THz radiation to Josephson junctions, whilst considering the low Josephson junction impedance and the electrical properties of the YBa2Cu3O7 and substrate.
AB - Josephson junctions from high-temperature superconductors allow the characterization of frequency and power of high-frequency electromagnetic radiation in the THz range by evaluation of their current-voltage characteristic. This feature makes a Josephson junction suitable to be used as a sensor for the mapping of near and far-field distributions. The sensitivity of such a so-called Josephson cantilever is improved by using antennas to couple the radiation to the Josephson junction. In this work, the Josephson cantilever is fabricated with epitaxial yttrium barium copper oxide (YBa2Cu3O7) on a magnesium oxide (MgO) bicrystal substrate. A model for the surface impedance of YBa2Cu3O7 in the THz regime is presented, which is required for highly efficient antenna designs. This model depends, among other properties, on the quality and thickness of the thin film. Also, the sensitivity of the Josephson cantilever is strongly dependent on the gain of the antenna and the impedance mismatch of the Josephson junction to the antenna's feed point. This work investigates suitable antenna designs for the coupling of 1.4, THz radiation to Josephson junctions, whilst considering the low Josephson junction impedance and the electrical properties of the YBa2Cu3O7 and substrate.
KW - Impedance
KW - Josephson junctions
KW - Surface impedance
KW - Substrates
KW - Mathematical models
KW - Antenna measurements
KW - Antenna feeds
KW - THz microscope
KW - Josephson cantilever
KW - HTS
KW - YBCO
KW - antennas
KW - simulation
KW - CST Studio
UR - http://www.scopus.com/inward/record.url?scp=85149394371&partnerID=8YFLogxK
U2 - 10.1109/tasc.2023.3249132
DO - 10.1109/tasc.2023.3249132
M3 - Article
VL - 33
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 5
M1 - 1800705
ER -