Terahertz Reflectivity of YBa2Cu3O7-δ at Cryogenic Temperatures

被引:4
作者
Parshin, Vladimir V. [1 ]
Serov, Evgeny A. [1 ]
Bubnov, Grigoriy M. [1 ,2 ]
Vdovin, Vyacheslav F. [1 ,2 ,3 ]
Nikolenko, Andrey S. [1 ]
Lesnov, Ilya V. [1 ,2 ]
Gunbina, Aleksandra A. [1 ,2 ]
Smirnov, Andrey V. [3 ]
Malginov, Vladimir A. [3 ]
Dolzhenko, Dmitry E. [4 ]
Khokhlov, Dmitry R. [4 ]
机构
[1] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603950, Russia
[2] Nizhniy Novgorod State Tech Univ, Nizhnii Novgorod 603950, Russia
[3] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
[4] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia
基金
俄罗斯科学基金会;
关键词
Cryogenically cooled antenna; electromagnetic reflection; high temperature superconductors; Q measurement; terahertz (THz) material; SURFACE-RESISTANCE; RESONATOR; ANTENNA; FILMS;
D O I
10.1109/TASC.2020.2994964
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Modern space-based telescopes operating in the terahertz (THz) spectral range require highly reflecting and cryogenically cooled optics ensuring extremely low noise. The idea of using high-temperature superconductor YBa2Cu3O7-delta as a telescope's mirror coating for providing low dissipation and high reflectivity of the surface for the subTHz frequency band has been explored. We are presenting here some results of measurements of the reflection losses in YBa2Cu3O7-delta at cryogenic and room temperatures (4.2-300 K) in the frequency band 0.166-0.23 THz. High-accuracy measurements of the absolute value of reflectivity have been performed with the help of the resonance technique. The measured reflection losses in the given frequency band were below 1%. For the same frequency range, these values are well above the reflection losses in normal metals such as copper or aluminum, which are normally used to covermirrors of telescopes. We, therefore, conclude that the use of high-T-c superconductors YBa2Cu3O7-delta as a highly reflecting coating for the THz telescope's mirror is not advisable.
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页数:5
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