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Terahertz Emission from the Intrinsic Josephson Junctions of High-Symmetry Thermally-Managed Bi2Sr2CaCu2O8+d Annular Microstrip Antennas

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Date Issued:
2018
Abstract/Description:
The intrinsic Josephson junctions in the high transition temperature superconductor Bi2Sr2CaCu2O8+? (BSCCO) have shown great potential for oscillators emitting in the terahertz frequency. The radiation frequency satisfies the conditions for both the ac Josephson effect and for a mesa cavity resonance mode. The observed angular dependence of the emissions from some mesa imply that the ac Josephson effect plays the primary role in a dual source radiation mechanism. But the integrated emission power had generally been significantly below the 1 mW level suitable for many applications. This output power can be enhanced by a suitable design of an array of suitably shaped mesas that are all within a wavelength of each other so that their combined output is coherent. One such tightly packed array consists of concentric annuli. Here we calculate the angularly independent modes of thin annular microstrip antennas, with the ratio of the inner to the outer radii varying from 0.1 to 0.9. We then calculate the angular distribution of the emission power arising from the annular cavity modes and from the uniform ac Josephson current source at the frequencies of the cavity modes. We also calculate the five leading wavefunctions with the lowest order angular dependence for those annuli.
Title: Terahertz Emission from the Intrinsic Josephson Junctions of High-Symmetry Thermally-Managed Bi2Sr2CaCu2O8+d Annular Microstrip Antennas.
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Name(s): Bonnough, Sheila, Author
Klemm, Richard, Committee Chair
Peale, Robert, Committee Member
Shivamoggi, Bhimsen, Committee Member
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2018
Publisher: University of Central Florida
Language(s): English
Abstract/Description: The intrinsic Josephson junctions in the high transition temperature superconductor Bi2Sr2CaCu2O8+? (BSCCO) have shown great potential for oscillators emitting in the terahertz frequency. The radiation frequency satisfies the conditions for both the ac Josephson effect and for a mesa cavity resonance mode. The observed angular dependence of the emissions from some mesa imply that the ac Josephson effect plays the primary role in a dual source radiation mechanism. But the integrated emission power had generally been significantly below the 1 mW level suitable for many applications. This output power can be enhanced by a suitable design of an array of suitably shaped mesas that are all within a wavelength of each other so that their combined output is coherent. One such tightly packed array consists of concentric annuli. Here we calculate the angularly independent modes of thin annular microstrip antennas, with the ratio of the inner to the outer radii varying from 0.1 to 0.9. We then calculate the angular distribution of the emission power arising from the annular cavity modes and from the uniform ac Josephson current source at the frequencies of the cavity modes. We also calculate the five leading wavefunctions with the lowest order angular dependence for those annuli.
Identifier: CFE0007314 (IID), ucf:52137 (fedora)
Note(s): 2018-12-01
M.S.
Sciences, Physics
Masters
This record was generated from author submitted information.
Subject(s): Josephson junction -- annular microstrip antennas -- Bi2Sr2CaCu2O8+?
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0007314
Restrictions on Access: campus 2019-12-15
Host Institution: UCF

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