Terahertz Nonreciprocal Isolator Based on Magneto-Plasmon and Destructive Interference at Room Temperature

Ji, Yunyun; Fan, Fei; Tan, Zhiyu; Chang, Shengjiang

doi:10.3389/fphy.2020.00334

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…This is probably because the local control of individual meta-atoms is challenging with bulky biasing magnets available. Non-reciprocal magnetic metasurfaces have been considered for one-way transmission using indium antimonide 29,30 , graphene 31 and yttrium iron garnet 32,33 . However, creating a passive phase-gradient NRM using gyromagnetic effects remains a challenge.…”

Section: Phase-gradient Nrmsmentioning

confidence: 99%

A self-biased non-reciprocal magnetic metasurface for bidirectional phase modulation

et al. 2023

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Non-reciprocal metasurfaces can encode optical functions on forward- and backward-propagating waves, and could be used to create non-reciprocal antennas and radomes for full-duplex wireless communication and radar systems. However, such metasurfaces typically require external electric- or magnetic-field biasing or rely on non-linear effects, which makes practical implementation challenging. Here we report a self-biased non-reciprocal metasurface based on magnetic meta-atoms made from lanthanum-doped barium hexaferrite. The metasurface offers a transmittance of up to 77% and an operation angle of ±64°. We show that they can be used for on-demand bidirectional phase modulation, which provides non-reciprocal functionalities including microwave isolation, non-reciprocal beam steering, non-reciprocal focusing and non-reciprocal holography. The approach could also be potentially extended to megahertz and optical frequencies by using different self-biased magnetic materials.

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Section: Phase-gradient Nrmsmentioning

confidence: 99%

A self-biased non-reciprocal magnetic metasurface for bidirectional phase modulation

et al. 2023

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“…Terahertz (THz) technology has made impressive progress in recent years, with a wide range of applications in spectroscopy, imaging, sensing, and communication [1][2][3]. This has partially benefited from the development of various THz functional devices, such as THz filters [4][5], modulators [6], polarizers [7], isolators [8], and sensors [9], etc. These devices are mostly based on a variety of functional materials including: liquid crystals [10][11], semiconductors [12], graphene [13], carbon nanotubes [14], etc.…”

Section: Introductionmentioning

confidence: 99%

Large Terahertz Birefringence in Nanocomposite Films Made From Magnetorheological Fluid

Chen,

Zhu,

Huang

et al. 2024

IEEE Trans. Plasma Sci.

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In this work, magnetic nanocomposite films were prepared using magnetorheological fluids and were characterized by time-domain terahertz spectroscopy.Applying magnetic field during the curing process of magnetorheological fluids makes Fe nanoparticles align into a chain-like structure. Permanent anisotropy is solidified in the films, resulting in a birefringence coefficient as high as 0.37 in a frequency range from 0.4 to 2.0 THz.The polarization state of terahertz wave can be converted by rotating the film at room temperature without external magnetic field. When the rotation angle is at 50°-60°, the ellipticity is greater than 0.8 in the frequency range of 1.19-1.6 THz, indicating that the film can be used as a quarter waveplate.

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“…In addition, the low modulation rate also greatly limited its practical applications. The other approach is to tailor the dielectric properties of the substrates [34][35][36][37][38][39][40]. In this method, in addition to the dielectric properties of the large thickness substrate material, which are difficult to modify, its high dielectric constant is also unfavorable to the tuning of metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Metasurfaces Exploiting the Phase Transition of Vanadium Dioxide

Liu,

Wei,

Taplin

et al. 2023

Materials

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Artificially designed modulators that enable a wealth of freedom in manipulating the terahertz (THz) waves at will are an essential component in THz sources and their widespread applications. Dynamically controlled metasurfaces, being multifunctional, ultrafast, integrable, broadband, high contrasting, and scalable on the operating wavelength, are critical in developing state-of-the-art THz modulators. Recently, external stimuli-triggered THz metasurfaces integrated with functional media have been extensively explored. The vanadium dioxide (VO2)-based hybrid metasurfaces, as a unique path toward active meta-devices, feature an insulator–metal phase transition under the excitation of heat, electricity, and light, etc. During the phase transition, the optical and electrical properties of the VO2 film undergo a massive modification with either a boosted or dropped conductivity by more than four orders of magnitude. Being benefited from the phase transition effect, the electromagnetic response of the VO2-based metasufaces can be actively controlled by applying external excitation. In this review, we present recent advances in dynamically controlled THz metasurfaces exploiting the VO2 phase transition categorized according to the external stimuli. THz time-domain spectroscopy is introduced as an indispensable platform in the studies of functional VO2 films. In each type of external excitation, four design strategies are employed to realize external stimuli-triggered VO2-based THz metasurfaces, including switching the transreflective operation mode, controlling the dielectric environment of metallic microstructures, tailoring the equivalent resonant microstructures, and modifying the electromagnetic properties of the VO2 unit cells. The microstructures’ design and electromagnetic responses of the resulting active metasurfaces have been systematically demonstrated, with a particular focus on the critical role of the VO2 films in the dynamic modulation processes.

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Terahertz Nonreciprocal Isolator Based on Magneto-Plasmon and Destructive Interference at Room Temperature

Cited by 13 publications

References 37 publications

A self-biased non-reciprocal magnetic metasurface for bidirectional phase modulation

A self-biased non-reciprocal magnetic metasurface for bidirectional phase modulation

Large Terahertz Birefringence in Nanocomposite Films Made From Magnetorheological Fluid

Terahertz Metasurfaces Exploiting the Phase Transition of Vanadium Dioxide

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