Erik Einarsson
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Design and Validation of a Metallic Reflectarray for Communications at True Terahertz Frequencies Open
Wireless communications in the terahertz band (0.1-10 THz) is a promising and key wireless technology enabling ultra-high data rate communication over multi-gigahertz-wide bandwidths, thus fulfilling the demand for denser networks. The com…
View article: Phonon Kinetics of Fructose at the Melting Transition
Phonon Kinetics of Fructose at the Melting Transition Open
Terahertz time domain spectroscopy (THz TDS) is used to measure the melting kinetics of fructose molecular crystals. Combining single-crystal anisotropy measurements with density functional calculations, we assign the phonon frequencies an…
Printability regimes of pure metals using contactless magnetohydrodynamic drop-on-demand actuation Open
We demonstrate a computational study used to evaluate drop-on-demand printability of liquid metals via a contactless magnetohydrodynamic (MHD) pumping method. We show that the ejection regimes of pure liquid metal droplets can be categoriz…
View article: Phonon Kinetics at the Solid to Liquid Phase Transition
Phonon Kinetics at the Solid to Liquid Phase Transition Open
Terahertz time domain spectroscopy (THz TDS) is used to measure the melting kinetics of fructose molecular crystals. Combining single crystal anisotropy measurements with density functional calculations we assign the phonon frequencies and…
The TeraNova platform: An integrated testbed for ultra-broadband wireless communications at true Terahertz frequencies Open
Terahertz (THz)-band (0.1 THz to 10 THz) communication is envisioned as a key technology to meet the demand for faster, more ubiquitous wireless communication networks. For many years, the lack of compact, fast and efficient ways to genera…
Origin of pseudo-dispersion in non-dispersive media by terahertz time-domain spectroscopy Open
We report the false appearance of dispersion in non-dispersive materials when measured by terahertz time-domain spectroscopy. This occurs when the material is measured in reflection geometry and has a bulk metal interface opposite to the i…
Graphene characterization using time-domain terahertz spectroscopy for plasmonic antenna design Open
Graphene's ability to support surface plasmon polaritons (SPPs) is of particular interest in the design of nanoscale plasmonic antennas. Since a dielectric-conductor interface is required to excite and sustain SPPs, a negative dielectric f…
Experimental characterization of a hybrid graphene/metal plasmonic antenna array Open
We fabricated terahertz-frequency plasmonic antenna arrays using patterned metallic structures atop a layer of graphene. The antenna design was developed through numerical simulations that were informed by experimentally obtained graphene …
Decoupling substrate thickness and refractive index measurement in THz time-domain spectroscopy Open
Terahertz time-domain spectroscopy (THz-TDS) relies heavily on knowing precisely the thickness or refractive index of a material. In practice, one of these values is assumed to be known, or their product is numerically optimized to converg…
Approaching completely continuous centimeter-scale graphene by copolymer-assisted transfer Open
We show that adding a copolymer layer atop PMMA prior to transfer results in nearly (99.8%) continuous cm-scale graphene.
Influence of thickness on crystallinity in wafer-scale GaTe nanolayers grown by molecular beam epitaxy Open
We grew wafer-scale, uniform nanolayers of gallium telluride (GaTe) on gallium arsenide (GaAs) substrates using molecular beam epitaxy. These films initially formed in a hexagonal close-packed structure (h-GaTe), but monoclinic (m-GaTe) cr…
Selective and confined growth of transition metal dichalcogenides on transferred graphene Open
We demonstrate confinement of CVD grown MoS2 to a patterned graphene area, forming a vertically stacked 2D heterostructure.