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Terahertz Beam Steering Concept Based on a MEMS-Reconfigurable Reflection Grating
2020
Sensors
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As a promising means for beam steering, micro-electro-mechanical system (MEMS)-based reflection gratings have been successfully implemented for terahertz beam control. ...
In this paper, we propose a design for a reconfigurable MEMS-based reflection grating consisting of multiple subwavelength reflectors which are driven by 5-bit, high-throw electrostatic actuators. ...
Conclusions In this paper, we have presented the device design of a reconfigurable MEMS-based reflection grating for beam steering at frequencies from 0.3 THz to 1 THz. ...
doi:10.3390/s20102874
pmid:32438568
fatcat:yjyx3te6sbc7zegt52bga7mx2i
Terahertz Reconfigurable Intelligent Surfaces (RISs) for 6G Communication Links
2022
Micromachines
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The focus of this review is on THz RISs with the potential to assist 6G communication functionalities including pixel-level amplitude modulation and dynamic beam manipulation. ...
To overcome these challenges, a cost-effective method to dynamically optimize the transmission path using reconfigurable intelligent surfaces (RISs) is widely proposed. ...
(d-f) MEMS-based metal-insulator-metal metadevices for beam steering. (d) Images of the fabricated metasurface in "ON" and "OFF" states. ...
doi:10.3390/mi13020285
pmid:35208409
pmcid:PMC8879315
fatcat:u3rlhefvanbfldlxo4rba2l6fi
Electrically Reconfigurable Micromirror Array for Direct Spatial Light Modulation of Terahertz Waves over a Bandwidth Wider Than 1 THz
2019
Scientific Reports
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We report the design, fabrication and experimental investigation of a spectrally wide-band terahertz spatial light modulator (THz-SLM) based on an array of 768 actuatable mirrors with each having a length ...
By means of spatially selective actuation, we used the mirror array as reconfigurable grating to spatially modulate terahertz waves in a frequency range from 0.97 THz to 2.28 THz. ...
For this purpose, we illuminated the complete aperture of the grating-based THz-SLM in a collimated terahertz beam and recorded the specular reflection. ...
doi:10.1038/s41598-019-39152-y
fatcat:3jmdhjzm65a6rhgsnacdb6z7by
Metamaterials – from fundamentals and MEMS tuning mechanisms to applications
2020
Nanophotonics
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Finally, we provide an outlook on the future research directions of MEMS-based metamaterials and their possible applications. ...
One recent technical advance in this field is the active metamaterial, in which the structure of metamaterials can be tuned to realize multiple states in a single device. ...
Figure 6 : 6 (A) Schematic of the MEMS grating optical phased array. The grating element is integrated on top of a comb drive in each unit cell. ...
doi:10.1515/nanoph-2020-0045
fatcat:kgok4p7zejdsvfjwzp6lkg5rom
Ultracompact Nanophotonics: Light Emission and Manipulation with Metasurfaces
2022
Nanoscale Research Letters
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A bunch of tunable and reconfigurable metasurfaces with diversified catalogs of mechanisms have been developed recently, enabling dynamic light modulation on demand. ...
This study presents an outlook on this merging paradigm for ultracompact nanophotonics with metasurfaces, also known as metaphotonics. ...
Based on this mechanism, a tunable diffraction grating is thereby demonstrated as well, providing a new avenue for beam Fig. 7 Electrically reconfigurable and tunable metasurfaces a Unity-order index ...
doi:10.1186/s11671-022-03680-w
pmid:35366127
pmcid:PMC8976740
fatcat:tp2sk7la6fbgfdh7vhp2s7zbni
A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications
2020
Sensors
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Second, the various methods for radiation beam scanning and beam reconfigurability are discussed through reflectarray and leaky-wave graphene antennas. ...
In this article, the aim is to provide a detailed review of the essential explanation behind graphene nanoantennas experimental proofs for the developments of graphene-based plasmonics antennas, achieving ...
We also acknowledge the University of Engineering and Technology Peshawar for improving and giving technical support on this article. ...
doi:10.3390/s20051401
pmid:32143388
fatcat:kh6zervmbzcb5bbcmdlgz6sdn4
Terahertz Metasurfaces: Toward Multifunctional and Programmable Wave Manipulation
2020
Frontiers in Physics
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In this article, we first give a simple review on recent advances on terahertz metasurfaces, including discussion of passive metasurfaces with fixed structures and active metasurfaces integrated with tunable ...
We mainly focus on some powerful functions, functional multiplexing, and real-time controlled applications in terahertz frequencies. ...
AUTHOR CONTRIBUTIONS All authors listed have made a substantial, direct and intellectual contribution to the work, and approved it for publication. ...
doi:10.3389/fphy.2020.584077
fatcat:i65pymm5pfh77gz4trk3uoxnee
A Digital Metamaterial of Arbitrary Base Based on Voltage Tunable Liquid Crystal
2019
IEEE Access
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In this paper, a digital metamaterial of arbitrary base based on liquid crystal (LC) is proposed. ...
Simulation results of two common functions, beam steering with a steering elevation angle 27 • and RCS reduction of at least 10 dB from 51 to 56 GHz, have been presented to prove the concept. ...
ACKNOWLEDGMENT The authors are grateful to Tianma Microelectronics Co., Ltd. in China for supplying the TIANMA9 liquid crystal material. ...
doi:10.1109/access.2019.2919318
fatcat:eeppem2e7zguff6xo3y3rc27em
Graphene Reflectarray Metasurface for Terahertz Beam Steering and Phase Modulation
[article]
2018
arXiv
pre-print
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This is based on the creation of a voltage controlled reconfigurable phase hologram, which can impart different reflection angles and phases to an incident beam, replacing bulky and fragile rotating mirrors ...
We report a THz reflectarray metasurface which uses graphene as active element to achieve beam steering, shaping and broadband phase modulation. ...
In summary, we reported a reconfigurable RA metasurface for terahertz waves using SLG. Beam steering, shaping and modulation were achieved. ...
arXiv:1806.02202v2
fatcat:yowlwwgf6ngmlnfc65irujmvdu
A Review on Metasurface: From Principle to Smart Metadevices
2021
Frontiers in Physics
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The metasurface with lab-on fiber-based devices is being discussed in this review paper. ...
Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. ...
Metasurface based mid-IR flat lens was developed for active beam steering [128] . ...
doi:10.3389/fphy.2020.586087
fatcat:md65y5b66bb7lgbzblttac2kc4
Graphene-based Antennas for Terahertz Systems: A Review
[article]
2017
arXiv
pre-print
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We review the use of graphene to develop reconfigurable, miniaturized, and efficient terahertz (THz) antennas and associated feeding networks, and attempt to identify current research trends and mid- and ...
We conclude by outlining our vision for the promising future of graphene-based THz antennas. ...
The same reflectarray concepts can be used to steer reflected or transmitted beams at will without necessarily -1 (bottom) . ...
arXiv:1704.00371v2
fatcat:5kosftstfvgovhfl3pkxs3ylqa
Breakthroughs in Microwaves: Programmable Terahertz Chip-Scale Surfaces and Systems—An Interview With Dr. Kaushik Sengupta
2021
IEEE Journal of Microwaves
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This introduction is then followed by a discussion of new programmable chip-scale electromagnetic surfaces as one of the solutions for THz applications. ...
This article ends with a lively discussion with one of the leaders in this technology, Dr. Kaushik Sengupta, who discusses further insight into this pioneering technique. ...
reflect beams to connect links. ...
doi:10.1109/jmw.2021.3107423
fatcat:bkx6zt6bzvexbe7653q6r7kzti
Multi-access laser terminal using liquid crystal beam steering
2005
2005 IEEE Aerospace Conference
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One requisite capability is multi-access communication where one terminal communicates with several other terminals. ...
The operation of transformational lasercom networks include terminal capabilities that are beyond those normally associated with one-to-one links. ...
This is a diffractive steering approach and it is typical of nonmechanical beam steering technologies including, acousto-optic gratings, MEMs arrays and liquid crystal on silicon optical phased arrays. ...
doi:10.1109/aero.2005.1559487
fatcat:4552wcydx5eynpvnxv6fanmsmy
Recent progress in terahertz metamaterial modulators
2022
Nanophotonics
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In this review, we present the latest developments in terahertz modulators based on metamaterials, while highlighting a few selected key applications in sensing, wireless communications and quantum electronics ...
The terahertz (0.1–10 THz) range represents a fast-evolving research and industrial field. ...
The tuning mechanism was based on optical inducing charges with a near infrared pulsed beam, in a standard optical-pump-terahertz-probe experiment. ...
doi:10.1515/nanoph-2021-0803
fatcat:y45j4stnujerdaq6q3x6bu7que
Tunable/Reconfigurable Metasurfaces: Physics and Applications
2019
Research
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With active elements incorporated into metasurface designs, one can realize tunable and/or reconfigurable metadevices with functionalities controlled by external stimuli, opening a new platform to dynamically ...
We first describe available approaches, categorized into different classes based on external stimuli applied, to realize homogeneous tunable/reconfigurable metasurfaces, which can offer uniform manipulations ...
By programming the reflective phase gradient on the device, the authors demonstrated that the reflected microwave beam can be electrically steered over +/-40 ∘ for both polarizations [112] . ...
doi:10.34133/2019/1849272
pmid:31549047
pmcid:PMC6750114
fatcat:6shtgvwnyzgingwtsk4lxrkudu
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