Active broadband terahertz wave impedance matching based on optically doped graphene–silicon heterojunction

Du, Wanyi; Zhou, Yixuan; Yao, Zehan; Huang, Yuanyuan; He, Chuan; Zhang, Longhui; He, Yuhang; Zhu, Lihua; Xu, Xinlong

doi:10.1088/1361-6528/ab0329

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…To dynamically manipulate THz interfacial impedance matching, Du et al have proposed an optical method to actively control THz impedance matching at the air/graphene/silicon interface, as shown in figure 4(d) [72]. Under photoexcitation by a 532 nm continuous wave laser, the optical doped carriers are introduced at the graphene/silicon interface (figure 4(e)), which can tune the THz conductivity of graphene/silicon to achieve the impedance matching at approximately 87 mW, as shown in figure 4(f).…”

Section: Thz Interfacial Impedance Matchingmentioning

confidence: 99%

“…However, the first and second transmitted THz pulses at the air/silicon interface slightly decrease with the pump power, as shown in figure 4(g). Notably, photoinduced doping not only achieves broadband THz impedance matching, but also acquires high modulation depth (92.7%) with only one layer graphene through controlling the interfacial properties [72]. This active all-optical method might be ultrafast at the scale of the photoexcited carrier lifetime.…”

Section: Thz Interfacial Impedance Matchingmentioning

confidence: 99%

“…To understand Goos-Hänchen and Imbert-Fedorov shifts in the THz region, the choice of advanced materials for the interface manipulation is essential. Graphene is a versatile, tunable, broadband optical material which can be used for active control [72] and for plasmonic enhancement in the THz regime [88]. As such, Fan et al proposed a graphene/metamaterial (epsilon-near-zero) heterostructure to achieve an electrically tunable Goos-Hänchen shift in the THz regime [89].…”

Section: Thz Wave Goos-hänchen and Imbert-fedorov Shifts At Interfacesmentioning

confidence: 99%

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Terahertz interface physics: from terahertz wave propagation to terahertz wave generation

Du¹,

Huang²,

Zhou³

et al. 2022

J. Phys. D: Appl. Phys.

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Terahertz (THz) interface physics as a new interdiscipline between THz technique and condensed matter physics has undergone rapid developments in recent years. Especially, the developments of advanced materials, such as graphene, transitional metal dichalcogenides, topological insulators, ferromagnetic metals, and metamaterials, have revolutionized the interface field and further promotes the development of THz functional devices based on interface physics. Moreover, playing at the interface with these advanced materials could unveil a wealth of fascinating physical effects such as charge transfer, proximity effect, inverse spin-Hall effect, and Rashba effect with THz technology by engineering the charge, spin, orbit, valley, and lattice degrees of freedom. In this review, we start from the discussion of the basic theory of THz interface physics, including interface formation with advanced materials, THz wave reflection and transmission at the interface, and band alignment and charge dynamics at the interface. Then we move to recent progresses in advanced materials from THz wave propagation to THz wave generation at the interface. In the THz wave propagation, we focus on the THz wave impedance-matching, Goos–Hänchen and Imbert–Fedorov shifts in THz region, interfacial modulation and interfacial sensing based on THz wave. In the THz wave generation, we summarize the ongoing coherent THz wave generation from van der Waals interfaces, multiferroic interfaces, and magnetic interfaces. The fascinating THz interface physics in advanced materials is promising and promoting novel THz functional devices for manipulating the propagation and generation of THz wave at the interfaces.

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Section: Thz Interfacial Impedance Matchingmentioning

confidence: 99%

Section: Thz Interfacial Impedance Matchingmentioning

confidence: 99%

Section: Thz Wave Goos-hänchen and Imbert-fedorov Shifts At Interfacesmentioning

confidence: 99%

See 1 more Smart Citation

Terahertz interface physics: from terahertz wave propagation to terahertz wave generation

Du¹,

Huang²,

Zhou³

et al. 2022

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, compared with the surface plasmons in metal, the plasmons in graphene have a longer excitation lifetime and can be effectively tuned, which make this configuration suitable for application in the THz field [105][106][107]. It has been theoretically and experimentally proved that graphene can be used for THz devices in different domains, such as by using active metasurfaces [108,109], and newer, better devices can be developed [110][111][112][113][114][115][116][117][118]. However, it is necessary to improve the relevant mechanism and manufacturing technique to obtain advanced industrially applicable devices.…”

Section: (C) Two-dimensional Materials and Phase Transition Materials Fmentioning

confidence: 99%

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

Zhang

Zeng

Kou

et al. 2020

Phil. Trans. R. Soc. A.

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The demand for smart and multi-functional applications in the terahertz (THz) frequency band, such as for communication, imaging, spectroscopy, sensing and THz integrated circuits, motivates the development of novel active, controllable and informational devices for manipulating and controlling THz waves. Metasurfaces are planar artificial structures composed of thousands of unit cells or metallic structures, whose size is either comparable to or smaller than the wavelength of the illuminated wave, which can efficiently interact with the THz wave and exhibit additional degrees of freedom to modulate the THz wave. In the past decades, active metasurfaces have been developed by combining diode arrays, two-dimensional active materials, two-dimensional electron gases, phase transition material films and other such elements, which can overcome the limitations of conventional bulk materials and structures for applications in compact THz multi-functional antennas, diffractive devices, high-speed data transmission and high-resolution imaging. In this paper, we provide a brief overview of the development of dynamic and active functional electromagnetic metasurfaces and their applications in the THz band in recent years. Different kinds of active metasurfaces are cited and introduced. We believe that, in the future, active metasurfaces will be combined with digitalization and coding to yield more intelligent metasurfaces, which can be used to realize smart THz wave beam scanning, automatic target recognition imaging, self-adaptive directional high-speed data transmission network, biological intelligent detection and other such applications. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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“…For example, in VO 2 film, THz reflection has been dynamically tuned by adjusting the temperature where conductivity is close to or far from the impedance matching state . Also, graphene achieves THz antireflection by controlling the number of stacked graphene layers or the angle of THz incident wave to reaching the impedance matching point. ,− Besides, nanostructured metal films, , conductivity polymer, and oxide semiconductor have also been studied for THz antireflection through the mechanism of impedance matching. However, the preparation of these nanoscale functional films usually requires expensive equipment or complex processes, and these studies are limited to THz antireflection rather than the efficient modulation of the reflected wave.…”

Section: Introductionmentioning

confidence: 99%

Optical-Transparent Self-Assembled MXene Film with High-Efficiency Terahertz Reflection Modulation

Feng

Huang

Zhu

et al. 2021

ACS Appl. Mater. Interfaces

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The modulation of the terahertz (THz) wave is fundamental for its applications in next-generation communications, biological imaging, sensing, and so forth. Searching for higher efficient modulation is still in progress, although plenty of materials have been explored for tuning THz wave. In this work, optical-transparent selfassembled MXene films are used to modulate the THz reflection at the SiO 2 /MXene/air interface based on the impedance matching mechanism. By adjusting the number of stacked MXene layers/ concentrations of MXene dispersions, the sheet conductivity of the MXene films will be changed so that the impedance at the SiO 2 / MXene/air interface can be tuned and lead to a giant modulation of THz reflection. Particularly, we demonstrate that the MXene films have highly efficient THz modulation from antireflection to reflectionenhancing with a relative reflection of 27% and 406%, respectively. This work provides a new pathway for developing the MXene films with the combination of optical-transparency and high smart THz reflection characteristics, and the films can be applied for THz antireflection or reflection-enhancing.

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Active broadband terahertz wave impedance matching based on optically doped graphene–silicon heterojunction

Cited by 11 publications

References 36 publications

Terahertz interface physics: from terahertz wave propagation to terahertz wave generation

Terahertz interface physics: from terahertz wave propagation to terahertz wave generation

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

Optical-Transparent Self-Assembled MXene Film with High-Efficiency Terahertz Reflection Modulation

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