Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Terahertz frequency"”.
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Terahertz frequency synthesis in CMOS for a chip-scale molecular clock
… chip-scale molecular clock (CSMC) based on terahertz electronics could enable low-cost, atomic-grade timekeeping for applications that are poorly served by existing clock technologies. However, the first CSMC left opportunities to optimize the terahertz electronics for a second version, for …
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Three Dimensional Interferometric Imaging at Terahertz Frequency for Concealed Object Detection
This project was born out of the work performed by a group of researchers at the New Jersey Institute of Technology (NJIT) [1] [2] [3] working on interferometric imaging with a spiral array. Their investigation stopped at two dimensional imaging with a two dimensional array. In this thesis, their …
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Empirical Nanotube Model: Applications to Water Channels and Nano -Oscillators
… the tube and force the ion to oscillate at a terahertz frequency. Such a nano-oscillator may hold potential applications as a room temperature terahertz wave detector.
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Distributed photomixers
Although the terahertz domain has been explored scientifically, components, especially sources, are needed to enable further exploration of the frequency range. A photomixer generates coherent THz radiation through optical heterodyne down-conversion. A terahertz-frequency beat signal on an optical …
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Investigating Hydration and Dynamics of Biomolecules in Solutions using High Precision Terahertz Spectroscopy
… give rise to absorption in the megahertz-to-terahertz frequencies. However, the strong absorption of water in this frequency range leads to a significant challenge in obtaining terahertz dielectric spectra of aqueous biomolecular solutions. In response, I have employed a high sensitivity …
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Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
… regions of crystalline samples, producing terahertz-frequency lattice vibrational waves that emanated outward from their multiple origins at lightlike speeds. Interferences among the waves resulted in fully specified far-field responses, including tilted, focusing, or amplified wavefronts. …
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Terahertz quantum cascade lasers
The development of the terahertz frequency range has long been impeded by the relative dearth of compact, coherent radiation sources of reasonable power. This thesis details the development of quantum cascade lasers (QCLs) that operate in the terahertz with photon energies below the semiconductor …
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Implementation of the Finite Difference Time Domain algorithm for the analysis of terahertz waves
… method for the study of various devices at terahertz frequencies. The FDTD method has emerged as one of the most widely used numerical analysis methods used for electromagnetic simulations. The FDTD method can be used to solve numerous types of problems ranging from modelling the behaviour …
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Terahertz time domain methods for material characterization of layered dielectric media
… On the other hand, the still under-explored Terahertz frequency range shows great promise and advantages for imaging and spectroscopy. As such, this dissertation provides a library of material parameter extraction tools of single and multiple layered dielectric mediums for different …
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Channel Sounding for D-Band Measurements
… Also of heavy interest is exploring the terahertz frequency band for communication potential in 6G. However, numerous channel sounding measurements must be collected to properly support channel models for this region. The work detailed in this thesis aims to address this current research …
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Electromagnetic pulse technology : biological and terahertz applications
… antenna to radiate high-energy pulses in the terahertz frequency range. The primary focus is to use these pulses for secure communications. Analytical calculations for the SwO are detailed. Numerical simulations are used to optimize and more thoroughly study the antenna. Various characteristic …
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Finite element characterisation of plasmonic waveguides in terahertz and optical frequencies
… has been considerable interest in exploiting the frequency bands in the terahertz regime to open up new frontiers of research across a diverse range of applications. An array of opportunities for creating novel technologies using this frequency band had remained largely unexplored and undeveloped …
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Empirical Nanotube Model: Applications to Water Channels and Nano-Oscillators
… the tube and force the ion to oscillate at a terahertz frequency. Such a nano-oscillator may hold potential applications as a room temperature terahertz wave detector.
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Time-domain terahertz magneto-spectroscopy of semiconductors
The terahertz frequency range, 0.1-10 THz, is one of the richest frequency ranges in condensed matter spectroscopy. Many important excitations and dynamical phenomena occur in this range, including superconducting gaps, protein conformational modes, phonons, and plasmons, just to name a few. …
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A Post-Fabrication Tuning Method for a Varactor-Tuned Microstrip Filter using the Space Mapping Technique
The RF (radio frequency) and microwave filter is of great importance in the most of the microwave applications which are widely used in broadcasting radios, televisions, radar techniques, telecommunications and satellite applications. Most of the microwave devices contain microwave filter blocks …
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Accurate Characterisation of Refractive Components for Future CMB Missions
… of refractive components for operation in the terahertz frequency band for future missions to measure the Cosmic Microwave Background (CMB) radiation. The specific components that were characterised were a set of dielectric lenses. These were made as part of a European Space Agency contract to …
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Design and Analysis of Quasioptical Components for use in Terahertz Optics and Future CMB Missions
… (Cosmic Microwave Background) missions in the terahertz frequency spectrum. In particular, the optical performance of PRISTINE, a mission proposal for the ESA fast (F) mission call and a PLA (Polylatic Acid) GRIN (Gradient Index) lens was analysed using GBM (Gaussian Beam Mode) theory and PO …
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High-speed terahertz signal control and read-out for future terahertz communication systems
The realisation of next-generation terahertz (THz) communication systems necessitates fast and efficient THz signal control and readout, enabling the encoding of data streams onto THz-frequency signals and their subsequent decoding. This project aims to design, develop, and demonstrate THz …
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Developments and applications of THz polaritonics, efficient THz generation, and single-shot THz detection
… describe work aimed at improving the two primary terahertz platforms that are used within the Nelson group: terahertz polaritonics and free space high field terahertz spectroscopy. The terahertz polaritonics platform consists of a thin slab of electro-optic material in which terahertz frequency …
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UAV-Enabled Wireless Communications: Deployment, Optimization, and Analysis
… frequencies, i.e., millimeter-wave (mmWave) and, terahertz frequency bands offer the substantial bandwidth required for such services. These high-frequency communications, however, depend critically on maintaining LoS connections to user terminals. In practical scenarios, users distributed in …
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