A Programmable Terahertz Metasurface With Circuit-Coupled Meta-Elements in Silicon Chips: Creating Low-Cost, Large-Scale, Reconfigurable Terahertz Metasurfaces

Venkatesh, Suresh; Lu, Xuyang; Saeidi, Hooman; Sengupta, Kaushik

doi:10.1109/map.2022.3176588

Cited by 14 publications

(2 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concept of passive arrays have received renewed interest in the form of 'reconfigurable intelligent surfaces (RIS) [102] to perform active beam steering for 6G communications. A prominent example is a reconfigurable transmitarray operated at 300 GHz [103]. This CMOS-based array can reconfigure its scattering element to achieve phase variation of 360 degrees, sufficient to form different beam patterns.…”

Section: B Beam Steering With Planar and Passive Systemsmentioning

confidence: 99%

THz Systems Exploiting Photonics and Communications Technologies

et al. 2023

View full text Add to dashboard Cite

Terahertz (THz) systems open up the possibility of new applications of electromagnetic waves. Enormous bandwidths up to several terahertz enable the development of powerful spectroscopy systems that can provide insights into the structure and material of objects with micrometer resolution. New high power and compact THz time-domain spectroscopy (TDS) systems will be presented. The wide bandwidth also enables high-resolution imaging under far-field conditions to analyze arbitrary objects from a distance. In addition, a near-field system-on-a-chip imaging system is presented that achieves a resolution of 10 μm. Additionally, the application of terahertz waves presents challenges due to the low transmit power of the sources, high attenuation in free space, and the high noise figures of the receivers. These challenges can be overcome by antennas with high gain. Since -depending on the application -spatial scanning or focusing in a time-varying direction is required, beam steering is an essential component of many THz systems. In terms of communications, terahertz carrier frequencies offer wide bandwidths, enabling correspondingly high data rates of 100 Gbit/s and more. As a result, the frequency bands between 250 GHz and 450 GHz have already been identified and/or allocated for communication services and are being discussed as a component of 6G mobile communications. Concepts and demonstrations for 6G terahertz mobile communications will be presented. The high bandwidth of terahertz waves can also be used for high-accuracy indoor localization.INDEX TERMS THz time-domain spectroscopy, high average power THz systems, THz far-field imaging, THz near-field imaging, THz communication, THz localization, MTT 70th Anniversary Special Issue.

show abstract

Section: B Beam Steering With Planar and Passive Systemsmentioning

confidence: 99%

THz Systems Exploiting Photonics and Communications Technologies

et al. 2023

View full text Add to dashboard Cite

show abstract

“…RISs are planar electromagnetic surfaces consisting of a large number of independently tunable reflecting elements. Depending on the design, each reflecting element can be externally tuned to alter the phase and, in some cases, the amplitude of the signal reflected at each reflecting element [2]. Due to the spatial superposition of the reflections of each element, the reflection pattern can be dynamically tuned without complex decoding, encoding, and RF processing operations.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystals: The way to Scalable and Practical Reconfigurable Intelligent Surfaces in 6G

Sáez¹,

Asadi²,

Neuder³

et al. 2022

Preprint

View full text Add to dashboard Cite

<p>With the rise of models describing the potential and limitations of Reconfigurable Intelligent Surfaces (RISs) in wireless communication and sensing channels, numerous hardware solutions are being developed. The most common solutions are based on varactors, Positive-Intrinsic-Negative (PIN) diodes, and Micro-Electro-Mechanical Systems (MEMS). Recently, several works on 1-bit nematic Liquid Crystal (LC) RISs have been published. This paper presents the use of LC technology for the realization of continuously tunable mm-Wave RISs to address the increasing interest in this technology. Starting from basic LC theory, we introduce two different realization methods, the reflectarray and the phased array method. Comparing LC technology to the competing technologies, we see that the main advantage is the low cost of large panels, followed by a low-power consumption. However, there are some challenges that the LC technology faces such as its impedance matching, its biasing, and tuning times in the order of 10s of ms. With this in mind, we analyze for which applications LC-based RISs are best suited. </p>

show abstract

Terahertz Beam Steering: from Fundamentals to Applications

Monnai

Sengupta

2023

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

Free-space transmission of terahertz (THz) waves opens great opportunities for wireless applications including sensing and communication in the 6G era and beyond. Owing to their wider bandwidths and shorter wavelengths, the use of THz waves enhances information capacity and spatial resolution while downsizing aperture sizes compared to microwaves. On the other hand, the shorter wavelengths of THz waves can involve severe path loss. To compensate for the path loss, directional transmission based on beam steering is indispensable. In this article, we review the development of THz beam steering, which has been a longstanding challenge as well as the generation of high-power THz waves. While the use of active or passive phased arrays is the predominantly utilized approach to implement beam steering, other approaches based on variable diffractive structures and frequency dispersive structures offer low-cost alternatives. We also emphasize that application-driven system design approaches, in which THz beam steering is tightly coupled to signal processing, have been emerging to overcome hardware limitations.

show abstract

A Programmable Terahertz Metasurface With Circuit-Coupled Meta-Elements in Silicon Chips: Creating Low-Cost, Large-Scale, Reconfigurable Terahertz Metasurfaces

Cited by 14 publications

References 62 publications

THz Systems Exploiting Photonics and Communications Technologies

THz Systems Exploiting Photonics and Communications Technologies

Liquid Crystals: The way to Scalable and Practical Reconfigurable Intelligent Surfaces in 6G

Terahertz Beam Steering: from Fundamentals to Applications

Contact Info

Product

Resources

About