Real-time object tracking using a leaky THz waveguide

Amarasinghe, Yasith; Mendis, Rajind; Mittleman, Daniel M.

doi:10.1364/oe.394825

Cited by 28 publications

(7 citation statements)

References 25 publications

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“…Finally, our structure opens the way to realize a long-standing goal in the THz range: conceiving devices with high quality optical properties combined with advanced integrated functionalities with active control. Concretely, our architecture could be used to enable amplitude or resonance detuning-based beam steering , and polarization control to achieve real-time tracking , and polarization division multiplexing , schemes in the THz, which would benefit future high-capacity wireless communications applications.…”

Section: Resultsmentioning

confidence: 99%

Monolithic Patch-Antenna THz Lasers with Extremely Low Beam Divergence and Polarization Control

Pérez-Urquizo

Todorov

et al. 2021

ACS Photonics

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Arrays of patch antennas have impacted modern telecommunications in the RF range significantly, owing to their versatility in tailoring the properties of the emitted radiation such as beam width and polarization, along with their ease of fabrication. At higher frequencies, in the terahertz (THz) range, there is a pressing need for a similar monolithic platform to realize and enable the advanced functionalities available in the RF technology. This platform would benefit a wide variety of fields such as astronomy, spectroscopy, wireless communications, and imaging. Here, we demonstrate THz lasers made of arrays of 10 × 10 patch antenna microcavities that provide up to 25 mW output power with robust single mode frequency and spatial mode. This device architecture leads to an unprecedented beam divergence, better than 2° × 2°, which depends only on the number of resonators. This allows to functionalize the device while preserving a high quality far-field pattern. By interconnecting the symmetric square microcavities with narrow plasmonic wires along one direction, we introduce an asymmetry into the originally degenerate and cross-polarized TM01 and TM10 modes, leading to a precise control of the resonant frequency detuning between the TM modes. This feature allows devices to be designed that radiate with any coherent polarization states from linear to circular. Large-scale full-wave simulations of the emission from entire arrays support our experimental results. Our platform provides a solution to finally achieve monolithic terahertz emitters with advanced integrated functionalities such as active beam steering and polarization control.

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Section: Resultsmentioning

confidence: 99%

Monolithic Patch-Antenna THz Lasers with Extremely Low Beam Divergence and Polarization Control

Pérez-Urquizo

Todorov

et al. 2021

ACS Photonics

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“…Typical examples of such two application scenarios are shown in Figures 26(a bandwidth according to (5), thereby leading to a better angle or frequency resolutions. Nevertheless, this is usually not a good idea for LWA-enabled frequency-scanning radars or tracking/imaging systems that require detecting and resolving both the range and angle parameters of multiple targets [35], [36], [194], [195], [196], [197], [198], [199], [200], [201], [202], [203], [204]. The reason for this is that the radar range resolution R is inversely proportionate to the available bandwidth BW, i.e., R = c/2BW, where c is referred to as the light speed.…”

Section: System-level Applications Of Leaky-wave Antennasmentioning

confidence: 99%

“…This is to guarantee that towards any given spatial angle within the FoV, the LWA would present consistent bandpass filtering behaviors that have fixed absolute bandwidth. If so, the angle and range resolutions of related radar or tracking/imaging systems would not change with the DoAs of targets or incoming signals [35], [36], [194], [195], [196], [197], [198], [199], [200], [201], [202], [203], [204], while the related frequency-division multiplexing systems may provide equalized bandwidth for each communication channel [34], [209], [210]. Therefore, the invention of novel concepts, structures, or techniques aiming at the realization of LWAs with a linear beam-scanning, stable gain, or stable beamwidth is worth being systematically pursued and investigated.…”

Section: A Linear Beam-scanning and Stable Radiation Beamwidth And Gainmentioning

confidence: 99%

“…For the same reason, it is anticipated that future THz communication systems (e.g., 6G), or the joint design of communication and radar sensing systems, may also be well compatible with the frequency-enabled beam-scanning solution. Under such circumstances, comprehensive developments of THz LWAs [34], [46], [196], [198], [200], [201], [202], [209], [222], [230], [231], [232], [233], [234], [235], which act as a key enabling front-end component for THz wireless systems, should be well considered. As a side note, using the antenna-on-chip (AoC) technology can be particularly interesting and useful for relevant THz developments, such as CMOS-based on-chip THz LWAs proposed in [234], [235].…”

Section: E Terahertz Developmentsmentioning

confidence: 99%

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Leaky-Wave Structures and Techniques for Integrated Front-End Antenna Systems

Zheng

Chan

2023

IEEE J. Microw.

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Leaky-wave antenna (LWA), as a special kind of waveguiding structure simultaneously characterized by both the guidance and radiation of electromagnetic waves along it, has received much attention and has been in the spotlight of both academia and industry since its inception in the 1940s. This is mainly because LWAs possess many appealing properties such as the highly directive beam, easy feeding mechanism, simple configuration, and particular frequency-driven beam-scanning, which enable them to hold promise in the development of a unique front-end antenna solution than others (e.g., reflector antenna and phased array). In addition to these inherent features, the exploitation of LWAs featuring multifarious sophisticated electrical functionalities (i.e., functional LWAs), with resort to engineering relevant radiating discontinuities and waveguiding structures, constitutes one mainstream research in the communities and increasingly prevails in the research & development of modern multifunctional wireless RF/microwave systems recently. This article is structured under this background, which is mainly dedicated to reviewing and investigating several enabling concepts, structures, and techniques that are specifically applied to the design of functional LWAs characterized by, for example, simultaneously low side-lobe and cross-polarization behaviors, rapid beam-scanning, stable radiation, frequency-selectivity, and open-stopband suppression. To make the technical discussions much more self-contained and systematic, this article begins with leaky-wave basics as well as general geometrical and electrical characteristics of LWAs. In addition, some representative system-level applications enabled by LWAs are briefly described, together with several promising research directions that can be further explored and galvanized, from the authors' perspective.

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“…As a low-cost and easy-to-manufacture travelingwave antenna, leaky-wave antenna can provide frequency-dependent narrow beams with high antenna gains [17], and own frequency-scanning capability [18,19]. It has been utilized in many areas such as frequency-division multiplexing THz communication [20], THz radar sensing [21][22][23], link discovery [14], and physical layer security enhancement [24]. One key feature of the leaky-wave antenna is that it enables the information transmissions in a spatial-spectral manner, i.e., frequencies are correlated with the transmission directions.…”

Section: Introductionmentioning

confidence: 99%

Spatial-spectral Terahertz Networks

Wang¹,

Tan²,

Li³

2021

Preprint

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This paper focuses on the spatial-spectral terahertz (THz) networks, where transmitters equipped with the leaky-wave antennas send information to their receivers at the THz frequency bands. As a directional and nearly planar antenna, leaky-wave antenna allows for information transmissions with narrow beams and high antenna gains. The conventional large antenna arrays are confronted with challenging issues such as scaling limits and path discovery in the THz frequencies. Therefore, this work exploits the potential of leaky-wave antennas in the dense THz networks, to establish low-complexity THz links. By addressing the propagation angle-frequency coupling effects, the transmission rate is analyzed. The results show that leaky-wave antenna is efficient for achieving high-speed transmission rate and the co-channel interference management is not necessary when the THz transmitters with large subchannel bandwiths are not extremely dense. A simple subchannel allocation solution is proposed, which enhances the transmission rate compared with the same number of subchannels with equal allocation of frequency band. After subchannel allocation, a low-complexity power allocation method is proposed to improve the energy efficiency.

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Real-time object tracking using a leaky THz waveguide

Cited by 28 publications

References 25 publications

Monolithic Patch-Antenna THz Lasers with Extremely Low Beam Divergence and Polarization Control

Monolithic Patch-Antenna THz Lasers with Extremely Low Beam Divergence and Polarization Control

Leaky-Wave Structures and Techniques for Integrated Front-End Antenna Systems

Spatial-spectral Terahertz Networks

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