Wireless communications sensing and security above 100 GHz

Jornet, Josep Miquel; Knightly, Edward W.; Mittleman, Daniel M.

doi:10.1038/s41467-023-36621-x

Cited by 58 publications

(8 citation statements)

References 81 publications

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“…The electromagnetic gap between electronic and optical regimes, widely-known as the terahertz (THz) band (from 0.1 THz to 10 THz), has been drawing increasing attention during the last years. Such interest is mainly driven by a plethora of applications, including spectroscopy [1], imaging [2], security [3], sensing [4], and communications [5][6][7][8][9][10][11][12], among others. The first challenge the researchers tackled was the development of THz sources and detectors, which * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Carvalho,

Moncada-Villa,

Mejía-Salazar

et al. 2024

J. Phys. D: Appl. Phys.

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In this work, we introduce a concept to enable dynamic beamforming of terahertz (THz) wavefronts using applied magnetic fields (B). The proposed system exploits the magnetically switchable hyperbolic dispersion of the InSb semiconductor. This phenomenology, combined with diffractive surfaces and magnetic tilting of scattered fields, allows the design of a metasurface that works with either circularly or linearly polarized wavefronts. In particular, we demonstrate numerically that the transmitted beam tilting can be manipulated with the direction and magnitude of B. Numerical results, obtained through the finite element method (FEM), are qualitatively supported by semi-analytical results from the generalized dipole theory. Motivated by potential applications in future Tera-WiFi active links, a metasurface is simulated for the working frequency f = 300 GHz. The results indicate that the transmitted field can be actively tuned to point in five different directions with beamforming of ±45°, depending on the magnitude and direction of B. In addition to magnetic beamforming, we also demonstrate that our proposal exhibits magnetic circular dichroism (MCD), which can also find applications in magnetically tunable THz isolators for one-way transmission/reflection.

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Section: Introductionmentioning

confidence: 99%

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Carvalho,

Moncada-Villa,

Mejía-Salazar

et al. 2024

J. Phys. D: Appl. Phys.

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“…THz frequency bands (0.1-10 THz) exhibit substantial potential in various applications, including high-precision spectrum detection, super-resolution imaging, and high-rate telecommunications [1,2]. Encouraging the communication * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Wafer-scale silicon microfabrication technology toward realization of low-cost sub-THz waveguide devices

Zhao,

Wu,

Liu

2024

J. Micromech. Microeng.

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This paper presents a wafer-scale silicon microfabrication technology for low-cost sub-terahertz (sub-THz) waveguide device applications. Based on the effective scheme, a WR-05 (110 - 170 GHz) straight rectangular waveguide and a WR-2.8 (260 - 400 GHz) rectangular waveguide bandpass filter are implemented as demonstrated examples. The silicon deep reactive ion etching (DRIE) process is employed to etch through the total thickness of the silicon wafer and form the main waveguide channels. Then, a low-temperature thermal compression process was used to bond the trough-etched wafer with the top and bottom metallised silicon wafers to form the closed waveguide structures without any precise alignment process. The fabricated waveguide has the benefit of low transmission loss (0.03-0.05 dB/mm) at the whole G band. Besides, to measure the fabricated devices and solve the measuring equipment standard waveguide difference, silicon micromachined waveguide transitions are explored and fabricated to match two different frequency-band modules for measuring the waveguide filters in the desired full frequency band, which also has a potential application for the different size waveguide conversion. The measured results agree well with the simulated ones. The measured 3dB bandwidth is 9.3%, with a central frequency of 343 GHz; the average insertion loss (IL) is about 1.6 dB in the pass band, including two extra straight waveguides of 8 mm length on input/output ends and two external waveguide-to-waveguide transitions. The proposed method provides a feasible and cost-effective solution for the mass production of high-performance waveguide devices and integrated systems in sub-THz frequency bands and beyond.

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“…The terahertz band between microwave and infrared light exhibits so many promising and great potential applications expanding from traditional fields of astronomy to new fields, such as medical diagnostics, [1,2] imaging, [3][4][5] radars, [6,7] communications, [8,9] and so on. Advances in efficient transceivers and antennas at terahertz frequencies are leading the transition of terahertz sensing and communications from its limited application areas to the upcoming wireless 6G system and Internet of Everything, [10,11] especially in the development of integrated sensing and communication (ISAC) that is expected to become a key technology for future wireless communication systems. [12] Nevertheless, it still remains challenging, especially in the design of high-efficiency antennas for high-resolution 6G terahertz spatial sensing, imaging, and communication.…”

Section: Introductionmentioning

confidence: 99%

All‐Dielectric Integrated Meta‐Antenna Operating in 6G Terahertz Communication Window

Shi,

Li,

Tang

et al. 2024

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Efficient transceivers and antennas at terahertz frequencies are leading the development of 6G terahertz communication systems. The antenna design for high‐resolution terahertz spatial sensing and communication remains challenging, while emergent metallic metasurface antennas can address this issue but often suffer from low efficiency and complex manufacturing. Here, an all‐dielectric integrated meta‐antenna operating in 6G terahertz communication window for high‐efficiency beam focusing in the sub‐wavelength scale is reported. With the antenna surface functionalized by metagrating arrays with asymmetric scattering patterns, the design and optimization methods are demonstrated with a physical size constraint. The highest manipulation and diffraction efficiencies achieve 84.1% and 48.1%. The commercially accessible fabrication method with low cost and easy to implement has been demonstrated for the meta‐antenna by photocuring 3D printing. A filamentous focal spot is measured as 0.86λ with a long depth of focus of 25.3λ. Its application for integrated imaging and communication has been demonstrated. The proposed technical roadmap provides a general pathway for creating high‐efficiency integrated meta‐antennas with great potential in high‐resolution 6G terahertz spatial sensing and communication applications.

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Wireless communications sensing and security above 100 GHz

Cited by 58 publications

References 81 publications

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Wafer-scale silicon microfabrication technology toward realization of low-cost sub-THz waveguide devices

All‐Dielectric Integrated Meta‐Antenna Operating in 6G Terahertz Communication Window

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