Electrically controllable THz asymmetric split-loop resonator with an outer square loop based on VO<sub>2</sub>

Park, D. J.; Shin, Jun‐Hwan; Park, K. H.; Ryu, Han-Cheol

doi:10.1364/oe.26.017397

Cited by 42 publications

(21 citation statements)

References 30 publications

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“…[63,[74][75][76][77][78][79][80] For example, a 1 mm by 1 mm sized array of gold slot nanoantennas resonating at ≈0.5 THz can be switched by a 500 V DC bias, with a 98% transmission tuning range (Figure 3a,b). Although electrical bias application is not considered a pure electrical process, it can still show a sufficiently fast switching speed (≈ns).…”

Section: Electrical Biasmentioning

confidence: 99%

“…[80] SRRs surrounded by a square fishnet grid over a 6 mm by 6 mm area on VO 2 can be electrically switched (Figure 4l,m). [80] SRRs surrounded by a square fishnet grid over a 6 mm by 6 mm area on VO 2 can be electrically switched (Figure 4l,m).…”

Section: Electrical Biasmentioning

confidence: 99%

“…2020, 8,1900548 [81] Copyright 2017, Optical Society of America. [80] Copyright 2018, Optical Society of America. Color code: orange for aluminum, gray for VO 2, and blue for the c-sapphire substrate.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

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Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

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Phase‐change phenomena have been an attractive research theme for decades due to the dynamic transition of material properties providing extraordinary capabilities for versatile optical device applications. Even at the terahertz (THz) frequency regime, phase‐change materials (PCMs) promote the development of dynamic devices, especially when combined with a plasmonic approach delivering strong field enhancement and localization. According to the design of plasmonic metamaterials or hybrid composites, PCMs can actively modulate the electromagnetic properties of THz waves through thermal, electrical, and optical means. In turn, THz waves can affect the PCM properties in the nonlinear regime due to the intense field strength enhancement by plasmonic structures. Here, a few types of PCMs demonstrating promising potential in THz plasmonic applications are introduced. Starting from the best‐known transition metal oxide, vanadium dioxide (VO2), which possesses an insulator‐to‐metal phase transition near room temperature, superconductors, chalcogenides, ferroelectrics, liquid crystals, and liquid metals are covered along with their phase‐change properties and the control mechanisms infused with THz plasmonic applications. The corresponding recent progress presenting how PCMs combined with plasmonic structures can demonstrate effective THz modulation is reviewed. This general overview may provide a better understanding of dynamic THz plasmonics and new ideas for future THz technology.

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Section: Electrical Biasmentioning

confidence: 99%

Section: Electrical Biasmentioning

confidence: 99%

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Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

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“…Combining reconfigurable metasurfaces with VO 2 is a widely used approach for THz active metasurfaces, which usually trigger the insulator-to-metal phase transition mechanisms by thermal heating [84,140], optical excitation [138,141,142] and electrical field application [83,143]. Zhang et al [84] experimentally demonstrated that a meta-holography approach using a VO 2integrated metasurface can be used to dynamically tune the overall holographic image.…”

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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“…Recently, Park et al fabricated a narrow-band filter in the terahertz frequency band by ingeniously designing the upper metal structure of a VO 2reconfigurable metamaterial and using the strong coupling characteristics of metal structure so that a driving voltage of only 5.5 V was required. However, the fabricated device showed a high insertion loss, and the maximum transmission rate was only 43% [19].…”

Section: Introductionmentioning

confidence: 98%

Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial

Chen

Cheng

Liang

2020

Advances in Condensed Matter Physics

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To date, little research has been carried out on the integration of switchable and diversified functionalities into a single metamaterial in the terahertz (THz) range. Here, a hybrid vanadium dioxide (VO2) metamaterial was designed with switchable properties of band-pass filter and band-stop filter in the frequency range of 0.3–1.6 THz. Simulations demonstrated that under TE polarization, the proposed system acted as band-stop filter with the center frequency of 0.95 THz when VO2 is in the insulating state. Upon the transformation of VO2 into the metallic state, the proposed system behaved as a band-pass filter with a transmittance of >80%. The physical mechanism of the band-pass/band-stop conversion was examined by analyzing the surface current distribution of the designed device. The switchable characteristics of this structure can enable its wide application in tunable THz functional components such as amplitude modulators, polarization control, and intelligent switches.

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Electrically controllable THz asymmetric split-loop resonator with an outer square loop based on VO₂

Cited by 42 publications

References 30 publications

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial

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Electrically controllable THz asymmetric split-loop resonator with an outer square loop based on VO2

Cited by 42 publications

References 30 publications

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial

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Electrically controllable THz asymmetric split-loop resonator with an outer square loop based on VO₂