José V. Siles
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View article: Water Hunting Advanced Terahertz Spectrometer on an Ultra-Small Platform (WHATSUP)
Water Hunting Advanced Terahertz Spectrometer on an Ultra-Small Platform (WHATSUP) Open
The search for extraterrestrial bio-signatures and the origin of Earth’s water remain two of the most compelling questions in planetary science. While no direct evidence of life beyond Earth has been found, water is a key prerequisite for …
View article: A Power-Combined 240 GHz Frequency-Multiplier Source for Cloud Radar Applications
A Power-Combined 240 GHz Frequency-Multiplier Source for Cloud Radar Applications Open
We present the design and testing of a >400 mW solid-state G-band transmitter developed for cloud radar applications. The source relies on GaAs on-chip power-combined Schottky diode frequency-triplers operating over a bandwidth that includ…
View article: The Evolution of Applications, Hardware Design, and Channel Modeling for Terahertz (THz) Band Communications and Sensing: Ready for 6G?
The Evolution of Applications, Hardware Design, and Channel Modeling for Terahertz (THz) Band Communications and Sensing: Ready for 6G? Open
For decades, the terahertz (THz) frequency band had been primarily explored in the context of radar, imaging, and spectroscopy, where multi-gigahertz (GHz) and even THz-wide channels and the properties of terahertz photons offered attracti…
View article: Water vapor measurements inside clouds and storms using a differential absorption radar
Water vapor measurements inside clouds and storms using a differential absorption radar Open
NASA's Vapor In-cloud Profiling Radar (VIPR) is a tunable G-band radar designed for in-cloud and precipitation humidity remote sensing. VIPR estimates humidity using the differential absorption radar (DAR) technique. This technique exploit…
View article: Guest Editorial
Guest Editorial Open
The 32nd International Symposium on Space Terahertz Technology (ISSTT 2022) was held in Spain for the first time. Baeza is a city full of renaissance buildings and cobbled streets, and one of the 15 UNESCO World Heritage cities in Spain. T…
View article: Comment on egusphere-2023-1807
Comment on egusphere-2023-1807 Open
Abstract. NASA’s Vapor In-cloud Profiling Radar (VIPR) is a tunable G-band radar designed for in-cloud and precipitation humidity remote sensing. VIPR estimates humidity using the differential absorption radar (DAR) techni…
View article: Quasi-Optical LO Coupling Validation for a Planarly Integrated 2 × 2 Pixel Heterodyne Array at 1.95 THz
Quasi-Optical LO Coupling Validation for a Planarly Integrated 2 × 2 Pixel Heterodyne Array at 1.95 THz Open
Terahertz heterodyne spectrometer instruments have been traditionally limited to a single pixel or a handful of pixels due to integration and assembly constraints and a limited availability of local oscillator (LO) power. As a solution we …
View article: Water Vapor Measurements inside clouds and storms using a Differential Absorption Radar
Water Vapor Measurements inside clouds and storms using a Differential Absorption Radar Open
NASA’s Vapor In-cloud Profiling Radar (VIPR) is a tunable G-band radar designed for in-cloud and precipitation humidity remote sensing. VIPR estimates humidity using the differential absorption radar (DAR) technique. This technique exploit…
View article: CO2 COLLISIONAL BROADENING OF THE 557 GHz WATER ABSORPTION FEATURE PROFILED WITH A DIFFERENTIAL ABSORPTION RADAR PLATFORM
CO2 COLLISIONAL BROADENING OF THE 557 GHz WATER ABSORPTION FEATURE PROFILED WITH A DIFFERENTIAL ABSORPTION RADAR PLATFORM Open
View article: Silicon Micromachined Waveguide Circuit for a 2 THz Schottky Receiver: Progress and Challenges
Silicon Micromachined Waveguide Circuit for a 2 THz Schottky Receiver: Progress and Challenges Open
Space instruments that operate in the THz range can enable unique measurements for a better understanding of the chemical and physical processes taking place in our Universe. One such application of this technology is a compact 2.06 THz re…
View article: Dynamic spectrum sharing between active and passive users above 100 GHz
Dynamic spectrum sharing between active and passive users above 100 GHz Open
Sixth-generation wireless networks will aggregate higher-than-ever mobile traffic into ultra-high capacity backhaul links, which could be deployed on the largely untapped spectrum above 100 GHz. Current regulations however prevent the allo…
View article: Thermal Design of ASTHROS
Thermal Design of ASTHROS Open
View article: Improving FM Radar Dynamic Range Using Target Phase Noise Cancellation
Improving FM Radar Dynamic Range Using Target Phase Noise Cancellation Open
A method for improving the dynamic range of frequency-modulated continuous-wave (FMCW) radar systems is presented. Bright echo signals detected with FMCW radars can carry strong phase noise sidelobes, especially for radars at W-band and hi…
View article: Multiple terahertz beams based on a Fourier grating and a quantum cascade laser
Multiple terahertz beams based on a Fourier grating and a quantum cascade laser Open
Large heterodyne receiver arrays (~100 pixel) allow astronomical instrumentations mapping more area within limited space mission lifetime. One challenge is to generate multiple local oscillator (LO) beams. Here, We succeeded in generating …
View article: 81 supra-THz beams generated by a Fourier grating and a quantum cascade laser
81 supra-THz beams generated by a Fourier grating and a quantum cascade laser Open
Large heterodyne receiver arrays (~100 pixel) allow astronomical instrumentations to map more area within limited space mission lifetime. One challenge is to generate multiple local oscillator (LO) beams. Here, we succeeded in generating 8…
View article: Far-Infrared Heterodyne Array Receivers
Far-Infrared Heterodyne Array Receivers Open
Astro 2020 Decadal Survey APC White paper
View article: Boundary-layer water vapor profiling using differential absorption radar
Boundary-layer water vapor profiling using differential absorption radar Open
Remote sensing of water vapor in the presence of clouds and precipitation constitutes an important observational gap in the global observing system. We present ground-based measurements using a new radar instrument operating near the 183 G…
View article: Boundary-layer water vapor profiling using differential absorptionradar
Boundary-layer water vapor profiling using differential absorptionradar Open
Remote sensing of water vapor in the presence of clouds and precipitation constitutes an important observational gap in the global observing system. We present ground-based measurements using a new radar instrument operating near the 183 G…
View article: SmallSat interferometry for THz astrophysics
SmallSat interferometry for THz astrophysics Open
While great strides have been made in far-infrared astrophysics with the NASA Spitzer and ESA Herschel missions, subarcsecond spatial resolution from space is still beyond the reach of current technologies. The Atacama Large Millimeter Arr…