Focused terahertz waves generated by a phase velocity gradient in a parallel-plate waveguide

McKinney, Robert; Monnai, Yasuaki; Mendis, Rajind; Mittleman, Daniel M.

doi:10.1364/oe.23.027947

Cited by 21 publications

(8 citation statements)

References 25 publications

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“…A prototype of a focusing LWA has been constructed by combining a slotted flat aluminum plate with a curved bottom surface fabricated via 3D printing. 159 Focusing above the top plate has been experimentally demonstrated at 100 GHz and 170 GHz.…”

Section: B Fast-wave Implementationsmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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Section: B Fast-wave Implementationsmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…where sinc(x) = sin(x)/x, β is the wave vector of the TE 1 guided wave, k 0 = ω/c, L is the slot length, and α is a parameter which describes the loss of energy in the guided mode due to leakage out of the slot 14,18 . An alternative description relies on ray optics.…”

Section: Resultsmentioning

confidence: 99%

“…Leaky-wave devices have been employed in microwave systems for many years, although their investigation in the terahertz range is much more recent [13][14][15][16] . In a typical guided wave implementation of such devices, a signal propagating in a waveguide can couple through an aperture to "leak" out into free space, if the guided mode and the free-space mode satisfy a phase-matching condition on their parallel wave vector components.…”

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confidence: 99%

Single-shot link discovery for terahertz wireless networks

et al. 2020

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Of the many challenges in building a wireless network at terahertz frequencies, link discovery remains one of the most critical and least explored. In a network of mobile receivers using narrow directional beams, how do the nodes rapidly locate each other? This direction information is crucial for beam forming and steering, which are fundamental operations for maintaining link quality. As the carrier frequency increases into the terahertz range, the conventional methods used by existing networks become prohibitively time-consuming, so an alternative strategy is required. Using a leaky-wave antenna with a broadband transmitter, we demonstrate a single-shot approach for link discovery which can be accomplished much more rapidly. Our method relies on measurements of the width of a broad spectrum, and does not require any information about the phase of the received signal. This protocol, which relies on a detailed understanding of the radiation from leaky-wave devices, offers a realistic approach for enabling mobility in directional networks.

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“…The waveguide has a narrow slot opened in one of the metal plates, which (in the demux configuration) allows some of the guided wave to leak out into free space. Similar leaky-wave designs have been used in the RF community for many years 29 , but their use in the THz range has so far been limited 21 , 30 , 31 . The frequency of the emitted radiation at a given angle is determined by a phase-matching constraint: where k 0 = 2π v / c 0 is the wave vector for free space with v as the frequency of the signal and c 0 as the speed of light in vacuum.…”

Section: Introductionmentioning

confidence: 99%

Frequency-division multiplexer and demultiplexer for terahertz wireless links

et al. 2017

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The development of components for terahertz wireless communications networks has become an active and growing research field. However, in most cases these components have been studied using a continuous or broadband-pulsed terahertz source, not using a modulated data stream. This limitation may mask important aspects of the performance of the device in a realistic system configuration. We report the characterization of one such device, a frequency multiplexer, using modulated data at rates up to 10 gigabits per second. We also demonstrate simultaneous error-free transmission of two signals at different carrier frequencies, with an aggregate data rate of 50 gigabits per second. We observe that the far-field spatial variation of the bit error rate is different from that of the emitted power, due to a small nonuniformity in the angular detection sensitivity. This is likely to be a common feature of any terahertz communication system in which signals propagate as diffracting beams not omnidirectional broadcasts.

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Focused terahertz waves generated by a phase velocity gradient in a parallel-plate waveguide

Cited by 21 publications

References 25 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Single-shot link discovery for terahertz wireless networks

Frequency-division multiplexer and demultiplexer for terahertz wireless links

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