Teeter-totter effect of terahertz dual modes in C-shaped complementary split-ring resonators

Song, Zhiqiang; Zhao, Zhenyu; Zhao, Hongwei; Peng, Wei; He, Xiaoyong; Shi, Wangzhou

doi:10.1063/1.4927845

Cited by 20 publications

(4 citation statements)

References 31 publications

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“…In fact, most metamaterials made of positive metal structures, such as split-ring resonators [11][12][13], cut wires [14,15], or U-shaped resonators [16,17], exhibit a decrease in transmission at the resonance frequencies. Only negative structures, i.e., complementary structures, show a transmission enhancement [18,19]. In our case, a zoom of the far-field transmission of the metasurface is illustrated in the inset of Fig.…”

Section: Resultsmentioning

confidence: 82%

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Terahertz Selective Emission Enhancement from a Metasurface-Coupled Photoconductive Emitter in Quasi-Near-Field Zone

et al. 2019

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We present a THz emission enhancement of 41 times at 0.92 THz from a metasurface made of T-shaped resonators excited in a quasi-near-field zone. Such a metasurface has an intrinsic transmission minimum with Q factor of 4 at 1.25 THz under far-field excitation. When this metasurface is coupled onto the backside of a 625-μm-thick photoconductive emitter, the metasurface is below the Fraunhofer distance to the excitation source. As such, one broad enhancement around 0.47 THz and another extremely narrow enhancement at 0.92 THz in the emission spectrum are observed owing to a quasi-near-field excitation. Theoretically, the Q factor of the latter is up to 307, which is limited by the spectral resolution in experiment. The numerical simulations indicate that the T-shaped resonators serve as an array of plasmonic antennas resulting in the aforementioned emission enhancement of THz radiation.

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Section: Resultsmentioning

confidence: 82%

“…3 and shows a broad spectral dip at around 1.25 THz. Its Q factor is only about 4, which is derived from [19].…”

Section: Resultsmentioning

confidence: 99%

Terahertz Selective Emission Enhancement from a Metasurface-Coupled Photoconductive Emitter in Quasi-Near-Field Zone

et al. 2019

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“…Such structures are well known to induce a dipole, located at the boundaries of the opening on the opposite side of the conducting gap, due to the currents appearing under incident electromagnetic waves. Mainly for simplicity, CSRR can be treated as an LC circuit, where capacitance and induction form respectively along the entire length of the opening and at the conducting gap defined by θ (Figure 1a) [6]. Such treatment results in the formation of resonant emission peaks which mostly depend on the geometrical parameters of the metacell.…”

Section: C-shaped Metasurface Design and Fabricationmentioning

confidence: 99%

Terahertz imaging using C-shaped metallic metasurface-based optics

Ivaškeviciute-Povilauskiene,

Cižas,

Nacius

et al. 2024

Terahertz Photonics III

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“…During this study, the inverse SRR or complementary SRR (CSRR) structure, comprising periodic C-shaped openings in the conductive layer, is employed. The dipole in these structures is formed at the opening on the opposite side of the conductive gap [13]. One can note that the dipole itself can be generated due to charge carrier interaction with either separate magnetic or electric fields of the external radiation, or both, depending on how the incident radiation is applied [14].…”

Section: Flexible Optical Elements and Experimental Setupmentioning

confidence: 99%

Flexible terahertz optics: light beam profile engineering via C-shaped metallic metasurface

Ivaškevičiūtė-Povilauskienė,

Čižas,

Nacius

et al. 2023

Front. Phys.

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The potential of terahertz (THz) imaging implementation in a large variety of applications requires compact, reliable, and relatively low-cost solutions in systems constituents. Here we focus on the development of passive optical elements and demonstrate flexible and reliable THz beam profile engineering for imaging aims via mechanical bending of a stainless steel-based C-shaped metasurface. The designed and laser-ablation technology fabricated metasurface provides compact THz focusing and enables THz light engineering as well as polarization control ability in THz imaging. Focusing, light profile engineering, and polarization control performances of the metasurfaces with different focal distances and C-shape designs are presented. Experimental data are well supported by simulations, using Finite Difference Time Domain (FDTD) method. THz images of different objects at ∼94 GHz using InP Gunn diode, bow-tie sensors, and exclusively metasurfaces-based optics are exposed. Further routes in the development of low-cost multicolor and polarization-sensitive THz imaging are discussed.

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Teeter-totter effect of terahertz dual modes in C-shaped complementary split-ring resonators

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Cited by 20 publications

References 31 publications

Terahertz Selective Emission Enhancement from a Metasurface-Coupled Photoconductive Emitter in Quasi-Near-Field Zone

Terahertz Selective Emission Enhancement from a Metasurface-Coupled Photoconductive Emitter in Quasi-Near-Field Zone

Terahertz imaging using C-shaped metallic metasurface-based optics

Flexible terahertz optics: light beam profile engineering via C-shaped metallic metasurface

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