Terahertz beam focusing based on plasmonic waveguide scattering

Monnai, Yasuaki; Altmann, Kristian; Jansen, Christian; Koch, Martin; Hillmer, Hartmut; Shinoda, Hiroyuki

doi:10.1063/1.4759042

Cited by 24 publications

(9 citation statements)

References 18 publications

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“…Our proposal is much simpler than previous ones [21] and at the same time leads to similar results. Moreover, it is possible to construct these devices by using a conventional 3D printer in about 40 min.…”

Section: Resultssupporting

confidence: 69%

3D Printed Terahertz Focusing Grating Couplers

Jahn

Weidenbach

Lehr

et al. 2017

J Infrared Milli Terahz Waves

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We have designed, constructed and characterized a grating that focuses electromagnetic radiation at specific frequencies out of a dielectric waveguide. A simple theoretical model predicts the focusing behaviour of these chirped gratings, along with numerical results that support our assumptions and improved the grating geometry. The leaky waveguide was 3D printed and characterized at 120 GHz demonstrating its potential for manipulating terahertz waves.

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Section: Resultssupporting

confidence: 69%

3D Printed Terahertz Focusing Grating Couplers

Jahn

Weidenbach

Lehr

et al. 2017

J Infrared Milli Terahz Waves

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“…III B, spatially modulating β and p such that θ s varies spatially can emulate diffractive optics. 146 Based on this concept, more specialized beams such as focused beams 147 and Bessel beams 148 can be generated, which is particularly relevant in the terahertz regime to replace bulky optical components. Such a concept can further be generalized under the waveguide-hologram developed in optics, 149 although the design is basically valid for a single frequency as inferred from Eq.…”

Section: Leaky-wave Antennasmentioning

confidence: 99%

“…An example of a terahertz LWA defined on a corrugated metal surface was implemented with aperiodic modulation of the groove depth. 147 The resulting contrast of the surface impedance serves as a scatterer that launches the guided mode into free-space. The spacing between adjacent scatterers was chirped, which yielded beam-focusing toward a point at 30 mm above the surface at 300 GHz.…”

Section: A Slow-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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“…In [6][7][8][9], corrugated structures were presented, and [10] presented a dipole structure. All structures in [1][2][3][4][5][6][7][8][9][10] are two-dimensional metamaterials on substrate. Three-dimensional structures with metamaterials offer attractive performance characteristics for a terahertz wave circuit and also greatly expand the potential of novel optical devices.…”

Section: Introductionmentioning

confidence: 99%

Quasi-three-dimensional post-array for propagation and focusing of a terahertz spoof surface plasmon polariton

2015

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This paper presents a quasi-three-dimensional post-array designed to propagate a terahertz spoof surface plasmon polariton (terahertz spoof SPP) with confinement. A transmission line making use of a terahertz spoof SPP is a promising device in the terahertz wave band, and there are many previous reports of two-dimensional structures. Three-dimensional structures provide sophisticated designs for transmission lines propagating a terahertz spoof SPP. Eigenmode analysis is used to derive a dispersion diagram for one post with boundary conditions extracted from the full model. The propagation frequency of the terahertz spoof SPP increases with lower heights or smaller diameters, and that remains virtually unchanged for post-spacing and thickness of a substrate. The analysis of the full model confirms the confinement of a terahertz spoof SPP vertically on the post-array. The magnitude of the electric field is strong around the top and bottom and weak at approximately one-third height. The terahertz spoof SPP is confined in the space around the post-array as well as a substrate, while it is confined only on substrates in conventional two-dimensional structures. The designed postarray can control the three-dimensional focusing of a terahertz spoof SPP in an arbitrary volume of space.

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Terahertz beam focusing based on plasmonic waveguide scattering

Cited by 24 publications

References 18 publications

3D Printed Terahertz Focusing Grating Couplers

3D Printed Terahertz Focusing Grating Couplers

Tutorial: Terahertz beamforming, from concepts to realizations

Quasi-three-dimensional post-array for propagation and focusing of a terahertz spoof surface plasmon polariton

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