Abstract

By applying a dc voltage V across the stack of intrinsic Josephson junctions naturally present in the high-temperature superconductor consisting of two parts bismuth, two parts strontium, one part calcium, two parts copper, and a bit more than eight parts oxygen, several groups have been able to obtain coherent THz emission at output powers in the µW range. In order to enhance the output power well into the mW range suitable for many applications, we have studied a compact design of a stand-alone mesa array with gold layers on the top and bottom of the superconductor. In this design, an array of twelve stand-alone mesas consisting of six identical interior pie-shaped wedge mesas and six identical exterior slitted annular mesas, all produced from an original stand-alone disk mesa of outer radius by one circular cut at smaller inner radius and three linear cuts through their center all mutually rotated by sixty degrees. We studied the cavity mode frequencies of the pie-shaped and six-fold slitted annular mesas with various ratios between inner and outer radii, in order to obtain a set of several matching cavity mode frequencies of the two different mesa shapes. The cavity mode frequencies of the six-fold slitted annular mesas have been compared with those obtained from the pie-sliced wedge mesas, in the quest to obtain at least two or three closely matching resonance frequencies. The matching wave functions for the two mesa shapes and the predictions for the angular distributions of the high-power output THz emission will be presented. Increasing the output power from the µW into the mW range will make a unique leap in the THz emission field which is needed for many industrial and medical uses.

Notes

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Graduation Date

2022

Semester

Summer

Advisor

Klemm, Richard

Degree

Doctor of Philosophy (Ph.D.)

College

College of Sciences

Department

Physics

Degree Program

Physics

Format

application/pdf

Identifier

CFE0009667; DP0027624

URL

https://purls.library.ucf.edu/go/DP0027624

Language

English

Release Date

February 2024

Length of Campus-only Access

1 year

Access Status

Doctoral Dissertation (Open Access)

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