Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications

Yu, Xiongbin; Sugeta, Masaki; Yamagami, Yuichiro; Fujita, Masayuki; Nagatsuma, Tadao

doi:10.7567/1882-0786/aaf4b3

Cited by 38 publications

(13 citation statements)

References 35 publications

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“…Free-standing multimode dielectric waveguides with excellent transitions were demonstrated using dielectric rod waveguides [25,26]. Alternatively, photonic crystalbased silicon waveguides [27][28][29][30] and its effective medium-based variants [31] have also demonstrated to feature lower losses of 0.05-0.1 dB/cm at bandwidths from 80-150 GHz to around 300 GHz. For comparison, rectangular hollow metallic waveguides feature losses around 1.3-1.9 dB/cm at 1 THz and similar relative bandwidth [32].…”

Section: Introductionmentioning

confidence: 99%

Broadband Terahertz Photonic Integrated Circuit with Integrated Active Photonic Devices

2021

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Present-day photonic terahertz (100 GHz–10 THz) systems offer dynamic ranges beyond 100 dB and frequency coverage beyond 4 THz. They yet predominantly employ free-space Terahertz propagation, lacking integration depth and miniaturisation capabilities without sacrificing their extreme frequency coverage. In this work, we present a high resistivity silicon-on-insulator-based multimodal waveguide topology including active components (e.g., THz receivers) as well as passive components (couplers/splitters, bends, resonators) investigated over a frequency range of 0.5–1.6 THz. The waveguides have a single mode bandwidth between 0.5–0.75 THz; however, above 1 THz, these waveguides can be operated in the overmoded regime offering lower loss than commonly implemented hollow metal waveguides, operated in the fundamental mode. Supported by quartz and polyethylene substrates, the platform for Terahertz photonic integrated circuits (Tera-PICs) is mechanically stable and easily integrable. Additionally, we demonstrate several key components for Tera-PICs: low loss bends with radii ∼2 mm, a Vivaldi antenna-based efficient near-field coupling to active devices, a 3-dB splitter and a filter based on a whispering gallery mode resonator.

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Section: Introductionmentioning

confidence: 99%

Broadband Terahertz Photonic Integrated Circuit with Integrated Active Photonic Devices

2021

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“…video transmission [57]. For short interconnects, silicon based photonic crystal waveguides were proposed and demonstrated [58][59][60]. In all these works, however, no in-depth analysis was presented as to the key reasons for the limitations in the transmission length and maximal bitrate in such fiber links.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Nallappan¹,

Cao²,

Xu³

et al. 2020

Preprint

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Terahertz (THz) band (0.1 THz-10 THz) is the next frontier for the ultra-high-speed communication systems. Currently, most of communications research in this spectral range is focused on wireless systems, while waveguide/fiber-based links have been less explored. Although free space communications have several advantages such as convenience in mobility for the end user, as well as easier multi-device interconnectivity in simple environments, the fiber-based communications provide superior performance in certain short-range communication applications such as multi-device connectivity in complex geometrical environments (ex. intra-vehicle connectivity), secure communications with low probability of eavesdropping, as well as secure signal delivery to hard-to-reach or highly protected environments. In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and tradeoffs in the link implementation. Particularly, we use air or foam-cladded polypropylene-core subwavelength dielectric THz fibers of various diameters (0.57-1.75 mm) to study link performance as a function of the link length of up to ~10 m, and data bitrates of up to 6 Gbps at the carrier frequency of 128 GHz (2.34 mm wavelength). We find that depending on the fiber diameter, the quality of the transmitted signal is mostly limited either by the modal propagation loss or by the fiber velocity dispersion (GVD). An error-free transmission over 10 meters is achieved for the bit rate of 4 Gbps using the fiber of smaller 0.57 mm diameter. Furthermore, since the fields of subwavelength fibers are weakly confined and extend deep into the air cladding, we study the modal field extent outside of the fiber core, as well as fiber bending loss. Finally, the power budget of the rod-in-air subwavelength THz fiber-based links is compared to that of free space communication links and we demonstrate that fiber links offer an excellent solution for various short-range applications.

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“…In very small sizes lower than the wavelengths, surface plasmons provide a suitable basis for the realization and manufacture of all-optical devices due to the increased intensity of concentrated optical fields. MIM waveguides are very important structures in plasmonic devices due to guiding surface plasmons in the crosssection of metal-dielectric structure [16,18,29,30]. Because these waveguides not only support the propagation of modes with very small wavelengths and high group velocities, but also show their ability to guide the wave up to relatively long distances.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of A Complete Full Adder Based On Metal-Insulator-Metal (MIM) Waveguide-Based Plasmonic Waves

Yoosefi

Rodríguez

2020

Preprint

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In this paper, metal-insulator-metal (MIM) plasmonic waveguide structures and a rectangular cavity resonator at a central frequency of 1550 nm were used to propose a complete full adder. Under this circumstances, the system has a fast function with slight variations in real- time or near real-time manner, and this led to its minimum power consumption, while serving in various situations. In this full adder, we benefited from the property of combining resonant waves in the first and second modes, and we managed to obtain a high transmission coefficient in states where the output must be active. This complete full adder operates through designing 4-input AND, XOR, OR, and NOT logic gates, resulting in the design of a complete full adder with low manufacturing complexity and cost relative to ones designed through combining the conventional 2-input AND and OR gates. In comparison of three computational methods, finite‐difference time‐domain (FDTD) is a simple and versatile method. This method directly discretizes the time‐domain partial differential form of Maxwell's equations in various dimensions while using analytical solution in the remaining direction and solving the 3D scattering problem. Therefore, necessary simulations were conducted using FDTD software, and showed a good fit to the results predicted through approximations intended for theoretical relations.

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Simultaneous low-loss and low-dispersion in a photonic-crystal waveguide for terahertz communications

Cited by 38 publications

References 35 publications

Broadband Terahertz Photonic Integrated Circuit with Integrated Active Photonic Devices

Broadband Terahertz Photonic Integrated Circuit with Integrated Active Photonic Devices

Dispersion Limited versus Power Limited Terahertz Transmission Links Using Solid Core Subwavelength Dielectric Fibers

Design and Analysis of A Complete Full Adder Based On Metal-Insulator-Metal (MIM) Waveguide-Based Plasmonic Waves

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