Polarization- and angle-dependent performances of terahertz three-dimensional metallic woven meshes

Liu, De Jun; Chen, Lin; Hattori, Toshiaki; Liu, Feng

doi:10.35848/1882-0786/aca4bb

Appl. Phys. Express

2022

DOI: 10.35848/1882-0786/aca4bb

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Polarization- and angle-dependent performances of terahertz three-dimensional metallic woven meshes

De Jun Liu

Lin Chen²,

Toshiaki Hattori³

et al.

Abstract: The transmission performance of three-dimensional metallic woven meshes (MWMs) is first investigated at terahertz frequencies, which is found to depend on incident polarizations and angles. A mode-splitting phenomenon occurs when the incident angle of transverse magnetic (TM) waves is oblique and above 25°. The low-frequency dip exhibits a similar modal pattern to that of surface modes. But the high-frequency dip exhibits an asymmetric field distribution, originating from the coupling between surface modes and… Show more

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Cited by 3 publications

References 21 publications

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Resonant conversion of THz waves with orthogonal polarization upon transmission through a woven mesh

Abrahamyan,

Parsamyan,

Manukyan

et al. 2024

Appl. Opt.

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The possibility of resonant conversion of wave fields oriented along the orthogonal sinusoidal conductors forming a woven mesh structure has been experimentally investigated using THz time-domain spectroscopy. This coupling, which enables the conversion of wave energy between surface waves appearing at co- and cross-oriented wires, results in a 90° rotation of the polarization of the waves transmitted through the woven mesh. A strong dependence of the phenomenon on the orientation of the woven mesh relative to the propagation direction and polarization of the incident THz waves has been shown and discussed. We believe that such properties of the metallic woven meshes can open up new prospects for investigating the interaction of THz waves with structured-wire grids.

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Resonant conversion of THz waves with orthogonal polarization upon transmission through a woven mesh

Abrahamyan,

Parsamyan,

Manukyan

et al. 2024

Appl. Opt.

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Efficient terahertz optical filtering with large-area all-metal and polymer-metal woven wire meshes

et al. 2023

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Many components for terahertz (THz) optical filtering are mechanically fragile and are hard to produce with large aperture, making them unsuitable for applications where larger THz beam diameter is required. In this work, the THz optical properties of industrial-grade, readily available and inexpensive woven wire meshes are studied using THz time-domain spectroscopy and numerical simulations. These meshes are meter-sized, free-standing sheet materials that are principally attractive for the use as robust, large-area THz components. Our results show that such meshes can act as efficient, tunable THz bandpass filters due to sharp plasmonic resonance supported by the interwoven metallic wires. Further, the meshes that combine metallic and polymer wires act as efficient THz linear polarizers with a polarization extinction ratio (field) above 60:1 for frequencies below 3 THz.

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Terahertz asymmetric metallic hole arrays with polarization-independent quasi-bound states in the continuum for membrane sensing

Liu¹,

Xi²,

Wu³

et al. 2023

Opt. Express

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Resonances with both high-quality factor and polarization-independent characteristics are highly desirable for terahertz (THz) sensing. Here, THz sensors based on asymmetric metallic hole arrays (AMHAs) are experimentally demonstrated. Such sensors consisting of four-hole arrays support polarization-independent quasi-bound states in the continuum (BICs). The induced quasi-BIC presents a quality factor exceeding 2000, which enables enhanced sensing for thin membranes. Results show that the frequency shift is 97.5 GHz for the 25-µm thick polyimide (PI), corresponding to a sensitivity of 147.7 GHz/RIU. The sensing performance strongly relates to the enhanced field originating from sharp quasi-BICs. A maximum field enhancement of 15.88 in contrast to the incident field is achieved. When the PI thickness is large than the decay length of enhanced fields, the interaction strength of field-PI becomes weak, resulting in a saturation effect for the shift of quasi-BICs. The proposed sensor possessing polarization-independent quasi-BICs has great potential for practical sensing applications in real-time chemical and biomolecular.

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Polarization- and angle-dependent performances of terahertz three-dimensional metallic woven meshes

Cited by 3 publications

References 21 publications

Resonant conversion of THz waves with orthogonal polarization upon transmission through a woven mesh

Resonant conversion of THz waves with orthogonal polarization upon transmission through a woven mesh

Efficient terahertz optical filtering with large-area all-metal and polymer-metal woven wire meshes

Terahertz asymmetric metallic hole arrays with polarization-independent quasi-bound states in the continuum for membrane sensing

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