Journal ArticleDOI
Superconducting emitters of THz radiation
TLDR
In this paper, a review of terahertz-emission devices based on the high-temperature superconductor Bi2Sr2CaCu2O8+δ is presented.Abstract:
Layered superconductors such as the copper-oxide high-temperature superconductor Bi2Sr2CaCu2O8+δ are emerging as compact sources of coherent continuous-wave electromagnetic radiation in the subterahertz and terahertz frequency ranges. The basis of their operation is the Josephson effect, which intrinsically occurs between the superconducting layers. The Josephson effect naturally converts a direct-current voltage into a high-frequency electric current. Therefore, a unique property of the devices reviewed here is the wide tunability of their frequency by varying the bias voltage. Recently, emission powers of free-space radiation of several hundreds of microwatts and emission linewidths as low as 6 MHz at 600 GHz have been achieved. These devices are promising for new applications in imaging, medical diagnostics, spectroscopy and security. Recent progress on terahertz-emission devices based on the high-temperature superconductor Bi2Sr2CaCu2O8+δ is reviewed. The emission mechanism is explained as a result of collective resonant modes in a stack of intrinsic Josephson junctions. Remarkable features of the linewidth, tunability, the optimum bias condition and the thermal influence are discussed.read more
Citations
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Journal Article
Emission of Coherent THz-Radiation from Superconductors.
TL;DR: It is demonstrated that coherent continuous-wave terahertz radiation of sizable power can be extracted from intrinsic Josephson junctions in the layered high-temperature superconductor Bi2Sr2CaCu2O8.
Journal ArticleDOI
Imaging of super-fast dynamics and flow instabilities of superconducting vortices
Lior Embon,Yonathan Anahory,Yonathan Anahory,Ž. L. Jelić,Ella Lachman,Y. Myasoedov,Martin E. Huber,Grigorii P. Mikitik,Alejandro Silhanek,Milorad V. Milošević,Alex Gurevich,Eli Zeldov +11 more
TL;DR: In this paper, Embon et al. used a nanoscale scanning superconducting quantum interference device to image vortices penetrating into a super-conducting Pb film at rates of tens of GHz and moving with velocities of up to tens of km/s.
Journal ArticleDOI
Direct observation of Josephson vortex cores
Dimitri Roditchev,Dimitri Roditchev,Christophe Brun,Lise Serrier-Garcia,Juan Carlos Cuevas,Vagner Henrique Loiola Bessa,Milorad V. Milošević,Milorad V. Milošević,François Debontridder,Vasily S. Stolyarov,Tristan Cren +10 more
TL;DR: In this article, superconducting correlations inside proximity Josephson junctions are mapped using scanning tunnelling microscopy, and it is shown that such Josephson vortices have real cores, in which the proximity gap is locally suppressed and the normal state recovered.
Journal ArticleDOI
Enhancement of terahertz photoconductive antenna operation by optical nanoantennas
Sergey Lepeshov,Andrei Gorodetsky,Andrei Gorodetsky,Alex Krasnok,Alex Krasnok,Edik U. Rafailov,Pavel A. Belov +6 more
TL;DR: In this article, the main results of hybrid optical-to-terahertz antennas and photomixers are summarized and compared to their implementation, and further perspectives of their development including an application of all-dielectric nanoantennas instead of plasmonic ones.
Journal ArticleDOI
Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures
Su-Fei Shi,Su-Fei Shi,Bo Zeng,Hui-Ling Han,Xiaoping Hong,Hsin-Zon Tsai,Han Sae Jung,Alex Zettl,Alex Zettl,Michael F. Crommie,Michael F. Crommie,Feng Wang,Feng Wang +12 more
TL;DR: In this article, the authors demonstrate efficient terahertz (THz) modulation by coupling graphene strongly with a broadband THz metasurface device, which shows near unity broadband transmission, which arises from coherent radiation of the enhanced local field in the slits.
References
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Book
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TL;DR: In this article, a revised version of the book has been published to incorporate the many new developments in superconductivity, including new topics on high temperature superconductors and nonequilibrium superconductivities.
Journal ArticleDOI
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