Enhancement of THz Radiation from Josephson Junctions in Superconductors Using Electromagnetic Resonators<br/>

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Enhancement of THz Radiation from Josephson Junctions in Superconductors Using Electromagnetic Resonators

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48249 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Ahmadi Boroujeni, Mehdi; Fardmanesh, Mehdi
Abstract:
Terahertz waves which includes frequencies between 100 GHz to 10 THz of electromagnetic spectrum have found many applications in science, medical treatments and industry. One of the recent methods to produce these waves is using nonlinear properties of superconductors based on Josephson junctions which inherently appear in some superconductors called BSCCO. Stack of intrinsic junctions of these superconducting materials can radiate terahertz waves by only applying a DC voltage across them. This Thesis investigates some of these structures based on Josephson junctions to produce coherent radiation of terahertz waves. For the optimization of the radiation power, this study also investigates the mesa geometry effects and Hotspot effects on terahertz radiation from these structures and a clear relation between them is proposed here. The electromagnetic resonances observed in these structures are also presented in this work and it is observed that the formation of the Hotspots causes further resonance in the structure enhancing the radiation power
Keywords:
Superconductor ; Josephson Junction ; Coherent THz Radiation ; Electromagnetic Resonators

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