We propose a novel subwavelength terahertz (THz) waveguide based on the magnetic plasmon polariton mode guided by a narrow gap in a negative permeability metamaterial. Deep subwavelength waveguiding (<lambda/10) with group velocities down to c/21.8 is demonstrated in a straight waveguide, a 90 degrees bend, and a splitter. The proposed waveguiding system inherently has no cutoff for any core wi...

Modern microelectronics and nanoelectronics devices rely on the drift of electron localized at the interfaces between different materials, such silicon and silicon dioxide or gallium arsenide and aluminum gallium arsenide. Hence, the electron drift transit time in the active region of a device determines the maximum device speed. Instead of the electron drift, we propose to use the waves of the...

Application of terahertz (THz) electromagnetic waves offers several opportunities for quality inspection in various industries. The THz waves penetrate many kinds of materials such as pharmaceutical coating, paper, plastic, ceramic, cardboard, wood, clothing, etc. We investigated possibilities of applying a THz imaging system in transmission geometry using the organic DSTMS crystals as a THz ge...

We successfully analyzed the concentrations of five amino acids in commercially available dietary amino acid supplements by using terahertz time-domain spectroscopy (THz-TDS) with an error of ± 12% for the best reproduced components. We also succeeded in analyzing tablets of the supplements wrapped in paper, and thus showed the merit of using THz waves for the nondestructive quantitative analys...

This study is aiming at designing by large-scale simulations a new nano-scale devices of high temperature superconductor (HTC) that would emit the terahertz wave continuously, for the purpose of developing a new application fields of teraherz waves that have been abandoned so far as the untapped frequency range between photon and radio waves. As a new light source, the continuous and frequency ...

We present a polarization shaping technique for few-cycle terahertz (THz) waves. For this, N femtosecond laser pulses are generated from a devised diffractive optical system made of as-many glass wedges, which then simultaneously illuminate on various angular positions of a sub-wavelength circular pattern of an indium arsenide thin film, to produce a THz wave of tailor-made polarization state g...

We investigate in this paper a new reconstruction method in order to perform 3D Terahertz (THz) tomography using a continuous wave acquisition setup in transmission mode. This method is based on the Maximum Likelihood for TRansmission tomography (ML-TR) first developed for X-ray imaging. We optimize the Ordered Subsets Convex (OSC) implementation of the ML-TR by including the Gaussian propagati...

The interference between two spectral lines of the frequency comb of a fiber femtosecond laser is used to generate millimeter-wave and terahertz tones. The two lines are selected by stimulated Brillouin scattering (SBS) amplification. All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with SBS. The inherent high s...

Supervisory Committee Dr. Thomas Edward Darcie, (Department of Electrical and Computer Engineering) Supervisor Dr. Jens Bornemann, (Department of Electrical and Computer Engineering) Departmental Member Dr. Colin Bradley, (Department of Mechanical engineering) Outside Member In this thesis, novel broadband waveguides capable of operating at terahertz (THz) frequencies are introduced. We explore...