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(Invited) Quantum Terahertz Electronics (QTE): Generation of Coherent Radiation from Mesa Structures of High-Temperature Superconducting Bi-2212 Intrinsic Josephson Junctions

Kazunori Kadowaki, Manabu Tsujimoto, Kaveh Delfanazari, Takeo Kitamura, Masashi Sawamura, Takanari Kashiwagi, Hidetoshi Minami, Richard A. Klemm

Published Jul 9, 2012• 0 citations
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Abstract

Demonstration of Quantum Terahertz Electronics (QTE): Generation of Coherent Radiation from Mesa Structures of High-Temperature Superconducting Bi-2212 Intrinsic Josephson Junctions.

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We report on measurements of the linewidth $\ensuremath{\Delta}f$ of terahertz radiation emitted from intrinsic Josephson junction stacks, using a Nb/AlN/NbN integrated receiver for detection. Previous resolution-limited measurements indicated that $\ensuremath{\Delta}f$ may be below 1 GHz---much smaller than expected from a purely cavity-induced synchronization. While at low bias we found $\ensuremath{\Delta}f$ to be not smaller than $\ensuremath{\sim}$500 MHz, at high bias, where a hot spot coexists with regions which are still superconducting, $\ensuremath{\Delta}f$ turned out to be as narrow as 23 MHz. We attribute this to the hot spot acting as a synchronizing element. $\ensuremath{\Delta}f$ decreases with increasing bath temperature, a behavior reminiscent of motional narrowing in NMR or electron spin resonance (ESR), but hard to explain in standard electrodynamic models of Josephson junctions.
Electromagnetic wave generation by mesoscopic intrinsic Josephson junctions of single crystal Bi2Sr2CaCu2O8+δ\mathrm{Bi_2Sr_2CaCu_2O_{8+\delta}}Bi2​Sr2​CaCu2​O8+δ​
We examine coupling interactions used to synchronize macroscopic Josephson oscillations induced in intrinsic Josephson-junction (IJJ) mesa stacks made of a Bi2212\mathrm{Bi}2212Bi2212 single crystal. Synchronized radiations of terahertz electromagnetic (EM) waves are detected under common voltage and current bias operations of two connected mesas with close individual radiation frequencies, while uncoupled and bimodal radiations are frequently observed in two mesas with different individual radiation frequencies. Detailed observations of the polarizations of the EM waves emitted when two mesas are biased in parallel or series allow us to reveal the coupling matrix components, which include ratios of synchronized IJJs in the mesas and phase delay between the macroscopic Josephson oscillations. A frequency evolution of the phase delay implies that the coupling between the Josephson oscillations is mediated by the small amplitude Josephson plasmon inside the superconducting substrate. This finding stimulates systematic survey on polarization of EM wave emitted from synchronized multiple mesa devices in order to realize powerful terahertz emissions from superconductors.