Ultrafast modulation of terahertz waves using on-chip dual-layer near-field coupling

Zhang, Yaxin; Ding, Kesen; Zeng, Hongxin; Kou, Wei; Zhou, Tianchi; Zhou, Hongji; Gong, Sen; Zhang, Ting; Wang, Lan; Liang, Shixiong; Lan, Feng; Dong, Yazhou; Feng, Zhihong; Gong, Yubin; Yang, Ziqiang; Mittleman, Daniel M.

doi:10.1364/optica.469461

Cited by 16 publications

(2 citation statements)

References 38 publications

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“…On the other hand, the different signals can be harvested and focused into spatial regions smaller than the wavelength, and thus be readily coupled into on-chip waveguides for post-processing and intrachip/interchip communication. In addition, the field enhancements of THz plasmonic waves can boost the light–matter interaction and thus enhance on-chip detection [388,389] and modulation [390–394] of THz signals.…”

Section: Discussionmentioning

confidence: 99%

Meta-optics inspired surface plasmon devices

Lang

Jiang

et al. 2023

Photonics Insights

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Surface plasmons (SPs) are electromagnetic surface waves that propagate at the interface between a conductor and a dielectric. Due to their unique ability to concentrate light on two-dimensional platforms and produce very high local-field intensity, SPs have rapidly fueled a variety of fundamental advances and practical applications. In parallel, the development of metamaterials and metasurfaces has rapidly revolutionized the design concepts of traditional optical devices, fostering the exciting field of meta-optics. This review focuses on recent progress of meta-optics inspired SP devices, which are implemented by the careful design of subwavelength structures and the arrangement of their spatial distributions. Devices of general interest, including coupling devices, on-chip tailoring devices, and decoupling devices, as well as nascent SP applications empowered by sophisticated usage of meta-optics, are introduced and discussed.

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Section: Discussionmentioning

confidence: 99%

Meta-optics inspired surface plasmon devices

Lang

Jiang

et al. 2023

Photonics Insights

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“…Based on these ideas, we have fabricated and tested a 32-anode SBD chain, which can be employed as a THz frequency doubler with a remarkable maximum frequency doubling e ciency of 38% and an impressive output power exceeding 300 mW at 0.17 THz. This work marks the rst utilization of arti cial microstructures to control the local electromagnetic eld distribution in a SBD array, combining the strengths of traditional frequency doubling RF circuit chip integration and the idea of near-eld coupling in THz integrated devices 32 . This approach opens up a new direction for the design of THz RF devices.…”

Section: Introductionmentioning

confidence: 99%

Record-breaking conversion efficiency in a THz nonlinear diode chain using an asymmetric double-layer topology

zhang,

Zhou,

Guo

et al. 2024

Preprint

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The exploitation of radiation in the terahertz (THz) range hinges on the continued development of THz sources. Schottky barrier diode (SBD)--based frequency multiplier devices are one of the most attractive options, as they can produce high power in comparison to direct generation, and can be integrated into all-solid-state systems. Yet, the scaling of the output power of such devices is often limited by the power handling capacity of a single diode. This motivates the idea of forming a connected chain of SBD devices, accompanied by a power combining approach to achieve higher THz output power. While effective, the uneven field distribution among the diodes can pose a significant challenge as it leads to lower efficiency and premature breakdown. This phenomenon is rooted in the similarity between the THz wavelength and the physical dimensions of the diodes themselves. To address this issue, we propose an innovative solution based on an asymmetric double-layer C-type diode chain structure. This arrangement allows for the adjustment of local electromagnetic field distribution, and dramatically enhances the conversion efficiency of the diode chain. Our device achieves the highest frequency doubling efficiency recorded at 38%, with an output exceeding 300 mW at 170 GHz. This design paves the way for a new direction in the development of diode-based THz nonlinear devices.

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All‐Dielectric Terahertz Metasurfaces for Multi‐Dimensional Multiplexing and Demultiplexing

Liu,

Jiang,

et al. 2024

Laser & Photonics Reviews

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Terahertz (THz) communication is an up‐and‐coming technology for the sixth‐generation wireless network. The realization of ultra‐high‐speed THz communication requires the combination of multi‐dimensional multiplexing schemes, including polarization division multiplexing (PDM), mode division multiplexing (MDM), and wavelength division multiplexing, to increase channel capacity. However, most existing devices for MDM in the THz regime are single‐purpose and incapable of multi‐dimensional modulation. Here, all‐dielectric metasurfaces are designed for 2D multiplexing/demultiplexing, which takes the lead in combining orbital angular momentum (OAM) MDM and PDM in the THz regime. The multi‐functional wavefront phase modulations and interleaved meta‐atom arrangements are used to realize polarization‐selective multichannel OAM mode (de)multiplexing, in which the linear‐polarized 4‐channel and circular‐polarized 6‐channel demultiplexing are experimentally demonstrated. Between different linear‐polarized channels, the measured maximum crosstalk is −16.88 dB, and the isolation of each channel can be greater than 10 dB in a range wider than 0.1 THz. This study paves the way for multi‐dimensional multiplexing in the THz regime, which may benefit extremely high‐capacity and integrated THz communication systems. The proposed design strategy is readily applied to multi‐functional metasurfaces for microwaves and far infrared light, facilitating the development of multiplexing technology and OAM‐related applications.

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Ultrafast modulation of terahertz waves using on-chip dual-layer near-field coupling

Cited by 16 publications

References 38 publications

Meta-optics inspired surface plasmon devices

Meta-optics inspired surface plasmon devices

Record-breaking conversion efficiency in a THz nonlinear diode chain using an asymmetric double-layer topology

All‐Dielectric Terahertz Metasurfaces for Multi‐Dimensional Multiplexing and Demultiplexing

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