Novel hollow‐core THz waveguides featuring hyperuniform disordered reflectors are proposed, fabricated, and characterized. The reflector comprises aperiodically positioned dielectric cylinders connected with bridges. proposed fabricated using a 3D MultiJet printer. Optical properties of the investigated numerically finite element method, as well experimentally terahertz time‐domain spectroscopy. results confirm that exhibit sizable photonic bandgaps (21%) even relatively low refractive index...

Abstract Reconfigurable terahertz electronics devices with high tuneability are pivotal for next-generation speed wireless communication and sensing technologies. Significant challenges exist realizing these devices, particularly on the design of smart metastructures that can manipulate electromagnetic radiation at frequencies fabrication effective reconfigurability. Here, we incorporate graphene into a graphene/gold bilayer superimposed metamaterial structure, which enables efficient...

Abstract Terahertz (THz) waves have been widely hailed as a key enabling technology for future sixth generation (6G) wireless networks. Dynamic modulation of their polarization states is great attraction high-capacity communications and anisotropic sensing. The development such is, however, still in very early stage owing to the difficulties realizing electrical reconfigurability THz devices. Artificially constructed metasurfaces new nanomaterials, graphene, shown provide revolutionary...

Summary The Upper Devonian Grosmont formation is a bitumen-saturated, carbonate unit located in Northern Alberta. It considered to be among the world?s next largest unconventional oil resource plays. Since early 2006, there has been an increased interest resources exhibited by range of companies, including super-majors. Several in-situ pilot tests were conducted central portion this area 1970s and 1980s, using steam combustion processes. Similar field McMurray sands before invention...

Through a combined experimental and theoretical investigation we determine that the fundamental modes of three quinacridones fall in terahertz spectral range (1–10 THz, ∼30–300 cm–1). In each spectrum resonances correspond to wagging, rocking, or twisting quinacridone rings, with most intense absorption being an in-plane rocking vibration carbonyl oxygens. spite these similarities, demonstrate measurements readily differentiate β-quinacridone, γ-quinacridone, 2,9-dimethylquinacridone. The...

We present a series of aspherical lenses and diffraction gratings 3D printed for use as optical components in terahertz spectroscopy systems. Commercially available plastics printing (VisyJet Crystal, Acrylonitrile Butadiene Styrene (ABS) Plastic acrylic based polymers) have also been characterized via Terahertz Time Domain Spectroscopy (TDS) two-color wave photomixing. In addition, characterization has achieved using synchrotron radiation at the Australian Centre Synchrotron Science. The...

Quinacridone and its substituted analogs are pigments widely used in art industry. The temperature dependence of the crystal structures two quinacridone polymorphs (β γ), along with common variant 2,9-dimethylquinacridone, were investigated using powder X-ray diffraction terahertz spectroscopy. These then compared solid-state density functional theory simulations both vibrations. patterns collected at eight temperatures range 13-298 K spectra fifteen 20-300 K. Simulations absolute zero...

Research Article| May 01 2008 SERVICE-LEARNING AS AN INTRODUCTION TO SOCIOLINGUISTICS AND LINGUISTIC EQUALITY Anne H. Charity; Charity Search for other works by this author on: This Site Google Jeree Harris; Harris Joe Hayes; Hayes Katie Ikeler; Ikeler Andrew Squires American Speech (2008) 83 (2): 237–251. https://doi.org/10.1215/00031283-2008-016 Cite Icon Share Facebook Twitter LinkedIn MailTo Permissions Citation Charity, Harris, Hayes, Ikeler, Squires; EQUALITY. 1 2008; doi: Download...

Spin-wave excitations in α-Fe2O3 nanorods were directly detected using time-of-flight inelastic neutron spectroscopy. The dispersive magnon features are compared with those bulk particles at various temperatures to highlight differences mode intensity and width. interchanged spectral intensities the nanorod a consequence of suppressed spin orientation, this is also evident diffraction which demonstates that weak ferromagnetic phase survives 1.5 K. Transmission electron microscopy shows...

We present terahertz spectroscopy and analysis of commercially available quinacridone pigments in the 0-5 THz range. Our results show clear distinction between β γ crystalline phases responsible for deep violet (β) to red (γ) colour pigments. reveal a large number absorptions regime shown depend on constituent phase as well temperature.

We present, evaluate and discuss the viability of commercial 3D printer filaments for use in terahertz printing applications. This is achieved a combined approach, analysing optical mechanical properties conjunction with filaments' overall printability. analyse 18 common exotic including: acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), nylon, polyethylene terephthalate (PET), high impact polystyrene (HIPS), polypropylene (PP), polycarbonate (PC) polyvinyl alcohol (PVA) their...

The low-dimensional quantum-magnet, linarite, PbCuS

This work presents far-infrared transmission spectroscopy on single crystal PbCuSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> (OH) xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> using synchrotron radiation. The study covers the spectral region 150-400 cm <sup xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> with electric field polarisation parallel to either a or b directions. results reveal number of anisotropic absorption...

The low-energy lattice dynamics of the quasiperiodic spin-ladder cuprate ${\mathrm{Sr}}_{14\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{Cu}}_{24}{\mathrm{O}}_{41}$ are investigated using terahertz frequency synchrotron radiation. A high density low-lying optical excitations is present in 1--3 THz energy range, while at least two highly absorbing stemming from long-wavelength acoustic oscillations incommensurate chain and ladder sublattices, observed subterahertz frequencies. effects Ca...

In this work, a 0.2 THz electrically tuneable frequency-selective absorber is designed, fabricated, and experimentally tested. The achieved through novel graphene/gold bilayer with superimposed metamaterial structure. With approach, high-quality resonance provided by the gold, electrical tuneability from graphene, in bilayer. 16 dB of amplitude tuning at designed demonstrated, alongside 95% broadband modulation for only 6V applied bias. Terahertz time domain spectroscopy reflection geometry...

Novel hollow-core THz waveguides featuring hyperuniform disordered reflectors are proposed, fabricated, and characterized. The reflector comprise aperiodically positioned dielectric cylinders connected with bridges. proposed fabricated using a 3D stereolithography printer. Optical properties of the waveguide investigated numerically finite element method, as well experimentally THz-TDS spectroscopy. results confirm that exhibit sizable photonic band gaps (20%) even when relatively low...