Terahertz Band Communications With Topological Valley Photonic Crystal Waveguide

Webber, Julian; Yamagami, Yuichiro; Ducournau, Guillaume; Szriftgiser, Pascal; Iyoda, Kei; Fujita, Masayuki; Nagatsuma, Tadao; Singh, Ranjan

doi:10.1109/jlt.2021.3107682

Cited by 39 publications

(14 citation statements)

References 41 publications

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“…Among them, the THz waveguide transmission technology with low loss, long distance, and low dispersion is very essential due to the signal distortion in free space, the attenuation caused by atmospheric scattering, and the water vapor absorption. Various THz waveguides have been proposed and investigated, such as hollow metallic structures [20], metal wires [21], dielectric waveguides [22], parallel plate structures [23], photonic crystal fibers [24], [25], rectangular structures [26], plasmonic [27], and tapered waveguide [28]. However, most of researchers focused on the low loss and low dispersion THz waveguides and paid little attention to the transverse standing waves (i.e., the guided wave modes).…”

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confidence: 99%

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Liu

Zhang

et al. 2022

IEEE Photonics J.

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Terahertz (THz) propagation in periodic structures has attracted great attention because of its captivating electrical and optical properties. However, the created THz band gaps are usually considered to be caused by Bragg resonances. Here, we theoretically and numerically investigate THz resonances and their related band gap properties in a periodically corrugated plate waveguide with arbitrary wall profiles. It has been found that the corrugated structure can cause not only the interaction between the same transverse modes, called the Bragg resonance, but also the strong interference between different transverse standing wave modes, which occurs in a higher frequency range with quite different features. Unlike the well-known Bragg resonance, the excited resonances between different transverse modes can produce the stronger energy attenuation and wider frequency band gap. The dispersion diagram is depicted to clearly describe the relationship between these resonances and waveguide geometries. Using this method, we can properly estimate the band gap structure of THz waveguides, which has been confirmed by the simulated results. In addition, these two resonances can be easily manipulated by changing the symmetry of waveguide structures. These findings on THz propagation in periodic waveguides could be applicable in high performance devices, such as filters, modulators and switches.

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confidence: 99%

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Liu

Zhang

et al. 2022

IEEE Photonics J.

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“…[6] In addition, there is increasing demand for active on-chip THz photonic devices with negligible losses that could be heterogeneously integrated with RF complementary metaloxide-semiconductor (CMOS) electronics. [6] Thus far, integrated THz photonic solutions have been limited to passive interconnects [7][8][9][10][11] and routing. [12] Integrated photonic circuits typically suffer losses due to the back-reflection of guided waves.…”

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confidence: 99%

Active Ultrahigh‐Q (0.2 × 10⁶) THz Topological Cavities on a Chip

et al. 2022

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ever-increasing demand for higher data transfer rates in wired and wireless communication links. The exponential growth in data rates has pushed the carrier frequencies toward the higher spectral region, the terahertz (THz) band. The availability of ultrahigh bandwidths in the THz region (0.1-10 THz) allows achievement of terabits per second connectivity, [1] making it ideal for sixth-generation (6G) communication. However, with the emergence of 6G networks, the development of efficient on-chip communication with low loss and active control is crucial to handle and process the massive volume of data transmitted using THz carrier frequencies. The existing solutions for high-speed on-chip interconnects, including copper-based electrical interconnects (EIs), [2] suffer from limited bandwidth, and optical interconnects (OIs) [3] possess integration complexity and electronic-to-optical (EO/OE) conversion losses. To circumvent the existing performance gaps (in terms of bandwidths, energy efficiency, and system simplicity) of on-chip interconnects, THz interconnects [4,5] offer a potential route by leveraging the advantages of both the electronic and photonic worlds. However, scaling carrier frequencies up to sub-THz and beyond requires further innovation toward on-chip photonic solutions to support higher radio-frequency (RF) electronics Rapid scaling of semiconductor devices has led to an increase in the number of processor cores and integrated functionalities onto a single chip to support the growing demands of high-speed and large-volume consumer electronics. To meet this burgeoning demand, an improved interconnect capacity in terms of bandwidth density and active tunability is required for enhanced throughput and energy efficiency. Low-loss terahertz silicon interconnects with larger bandwidth offer a solution for the existing inter-/intrachip bandwidth density and energy-efficiency bottleneck. Here, a low-loss terahertz topological interconnect-cavity system is presented that can actively route signals through sharp bends, by critically coupling to a topological cavity with an ultrahigh-quality (Q) factor of 0.2 × 10 6 . The topologically protected large Q factor cavity enables energy-efficient optical control showing 60 dB modulation. Dynamic control is further demonstrated of the critical coupling between the topological interconnect-cavity for on-chip active tailoring of the cavity resonance linewidth, frequency, and modulation through complete suppression of the back reflection. The silicon topological cavity is complementary metal-oxide-semiconductor (CMOS)-compatible and highly desirable for hybrid electronic-photonic technologies for sixth (6G) generation terahertz communication devices. Ultrahigh-Q cavity also paves the path for designing ultrasensitive topological sensors, terahertz topological integrated circuits, and nonlinear topological photonic devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202202370.

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“…This has stimulated a growing interest for developing THz topological integrated circuits. Along this line, recently, on-chip THz communication was demonstrated using VPC waveguide 14,15 . However, these proof-of-concept devices exhibit limited bandwidth and lack active tunability, which is essential for integrated on-chip THz manipulation with advanced functionality.…”

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confidence: 99%

“…In addition, these valley edge states are single-mode and exhibit linear dispersion characteristics. The edge states also reduce the mode competition and frequency-dependent signal delay 14 and effectively allow the entire bandwidth of the VPC waveguide to be used for on-chip communication. This has stimulated a growing interest for developing THz topological integrated circuits.…”

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confidence: 99%

Phototunable chip-scale topological photonics: 160 Gbps waveguide and demultiplexer for THz 6G communication

et al. 2022

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The revolutionary 5G cellular systems represent a breakthrough in the communication network design to provide a single platform for enabling enhanced broadband communications, virtual reality, autonomous driving, and the internet of everything. However, the ongoing massive deployment of 5G networks has unveiled inherent limitations that have stimulated the demand for innovative technologies with a vision toward 6G communications. Terahertz (0.1-10 THz) technology has been identified as a critical enabler for 6G communications with the prospect of massive capacity and connectivity. Nonetheless, existing terahertz on-chip communication devices suffer from crosstalk, scattering losses, limited data speed, and insufficient tunability. Here, we demonstrate a new class of phototunable, on-chip topological terahertz devices consisting of a broadband single-channel 160 Gbit/s communication link and a silicon Valley Photonic Crystal based demultiplexer. The optically controllable demultiplexing of two different carriers modulated signals without crosstalk is enabled by the topological protection and a critically coupled highquality (Q) cavity. As a proof of concept, we demultiplexed high spectral efficiency 40 Gbit/s signals and demonstrated real-time streaming of uncompressed high-definition (HD) video (1.5 Gbit/s) using the topological photonic chip. Phototunable silicon topological photonics will augment complementary metal oxide semiconductor (CMOS) compatible terahertz technologies, vital for accelerating the development of futuristic 6G and 7G communication era driving the real-time terabits per second wireless connectivity for network sensing, holographic communication, and cognitive internet of everything.The symbiosis of physical, digital, and biological worlds is one of the core visions of sixth-generation (6G) communication 1 , driven by various foreseen disruptive applications like industrial automation, innovative society, intelligent healthcare system, massive internet-ofeverything, and energy-efficient networks. The realization of these applications critically requires ultra-high-speed connectivity with submillisecond latency times 2,3 . One of the tenets of the development of 6G technology is to expand the frontier of the radiofrequency (RF) spectrum into the terahertz (THz) band (beyond 300 GHz) for accessing the larger bandwidth 2,4 . As 6G wireless networks evolve, emerging communication devices are expected to handle a large volume of data, such as the real-time transmission of high resolution 8K video, paving the path towards remote healthcare and human augmentation. Thus, the system-on-chip architecture must support significant bandwidth signals to efficiently process and compute the extensive volume data to integrate seamlessly with 6G networks. High-speed on-chip

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Terahertz Band Communications With Topological Valley Photonic Crystal Waveguide

Cited by 39 publications

References 41 publications

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Active Ultrahigh‐Q (0.2 × 10⁶) THz Topological Cavities on a Chip

Phototunable chip-scale topological photonics: 160 Gbps waveguide and demultiplexer for THz 6G communication

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Terahertz Band Communications With Topological Valley Photonic Crystal Waveguide

Cited by 39 publications

References 41 publications

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

Active Ultrahigh‐Q (0.2 × 106) THz Topological Cavities on a Chip

Phototunable chip-scale topological photonics: 160 Gbps waveguide and demultiplexer for THz 6G communication

Contact Info

Product

Resources

About

Active Ultrahigh‐Q (0.2 × 10⁶) THz Topological Cavities on a Chip