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1. Laser THz emission nanoscopy and THz nanoscopy

   https://doi.org/10.1364/OE.382130  

   Pizzuto, Angela; Mittleman, Daniel_M; Klarskov, Pernille (June 2020, Optics Express)

   We present an experimental and theoretical comparison of two different scattering-type scanning near-field optical microscopy (s-SNOM) based techniques in the terahertz regime; nanoscale reflection-type terahertz time-domain spectroscopy (THz nanoscopy) and nanoscale laser terahertz emission microscopy, or laser terahertz emission nanoscopy (LTEN). We show that complementary information regarding a material’s charge carriers can be gained from these techniques when employed back-to-back. For the specific case of THz nanoscopy and LTEN imaging performed on a lightly p-doped InAs sample, we were able to record waveforms with detector signal components demodulated up to the 6^thand the 10^thharmonic of the tip oscillation frequency, and measure a THz near-field confinement down to 11 nm. A computational approach for determining the spatial confinement of the enhanced electric field in the near-field region of the conductive probe is presented, which manifests an effective “tip sharpening” in the case of nanoscale LTEN due to the alternative geometry and optical nonlinearity of the THz generation mechanism. Finally, we demonstrate the utility of the finite dipole model (FDM) in predicting the broadband scattered THz electric field, and present the first use of this model for predicting a near-field response from LTEN. 

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2. Multiplexing Schemes for sub-THz/THz Interconnects (Invited)

   Xuan Ding, Bo Yu (August 2022, 2022 IEEE International Symposium on Radio-Frequency Integration Technology)
3. Principles of spintronic THz emitters

   https://doi.org/10.1063/5.0057536  

   Wu, Weipeng; Yaw Ameyaw, Charles; Doty, Matthew F.; Jungfleisch, M. Benjamin (September 2021, Journal of Applied Physics)

   null (Ed.)
4. THz-Photoconductivity and THz-Conductivity in Metal-Organic Frameworks (MOFs)

   https://doi.org/10.1109/IRMMW-THz50927.2022.9895557  

   Neu, Jens; Ostresh, Sarah; Pattengale, Brian; Brudvig, Gary W. (August 2022, 47th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz))
5. PropagationMeasurementsandPathLossModelsfor sub-THz inUrbanMicrocells

   Yunchou Xing, Theodore S. (June 2021, IEEE International Conference on Communications)

   Terahertz frequency bands will likely be used for the next-generation wireless communication systems to provide data rates of hundreds of Gbps or even Tbps because of the wide swaths of unused and unexplored spectrum. This paper presents two outdoor wideband measurement campaigns in downtown Brooklyn (urban microcell environment) in the sub-THz band of 140 GHz with TX-RX separation distance up to 100 m: i) terrestrial urban microcell measurement campaign, and ii) rooftop surrogate satellite and backhaul measurement campaign. Outdoor omnidirectional and directional path loss models for both line-of-sight and non-line-of-sight scenarios, as well as foliage loss (signal attenuation through foliage), are provided at 140 GHz for urban microcell environments. These measurements and models provide an understanding of both the outdoor terrestrial (e.g., 6G cellular and backhaul) and non-terrestrial (e.g., satellite and unmanned aerial vehicle communications) wireless channels, and prove the feasibility of using THz frequency bands for outdoor fixed and mobile cellular communications. This paper can be used for future outdoor wireless system design at frequencies above 100 GHz. 

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