Terahertz Radiation Emitted from Intrinsic Josephson Junctions in High-Tc Superconductor Bi2Sr2CaCu2O8+δ

Hidetoshi MINAMI  Manabu TSUJIMOTO  Takanari KASHIWAGI  Takashi YAMAMOTO  Kazuo KADOWAKI  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.3   pp.347-354
Publication Date: 2012/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.347
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Josephson Junctions – Past 50 years and Future –)
intrinsic Josephson junction,  terahertz,  high-Tc,  superconductor,  

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The present status of superconducting terahertz emitter using the intrinsic Josephson junctions in high-Tc superconductor Bi2Sr2CaCu2O8+δ is reviewed. Fabrication methods of the emitting device, electrical and optical characteristics of them, synchronizing operation of two emitters and an example of applications to the terahertz imaging will be discussed. After the description of fabrication techniques by an Argon ion milling with photolithography or metal masks and by a focused ion beam, optical properties of radiation spectra, the line width, polarization and the spatial distribution of emission are presented with some discussion on the operation mechanism. For electrical properties, reversible and irreversible operations at high and low electrical currents, respectively, and electrical modulation of the radiation intensity for terahertz imaging are presented.