Terahertz narrow bandpass filters based on double-layer metallic woven meshes with engineered Fabry-Perot cavities

Liu, Dejun; Wu, Feng; Yu, Xi; Du, Weijie; Cao, Duo; Shi, Hui; Hattori, Toshiaki; Chen, Lin; Liu, Feng

doi:10.1016/j.optcom.2023.129990

Cited by 2 publications

(2 citation statements)

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“…Among them, narrow-band pass filters are essential in THz applications such as sensing, communications, optical instrumentation, spectroscopy, and astronomy [12][13][14][15][16]. Following the relevant reports, advanced THz narrowband filtering devices reported in recent years are as follows: The electromagnetically induced transparency (EIT) effect realized by metasurfaces have potential for narrowband filtering due to their narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Research of ultra-narrow band filters based on silicon nitride subwavelength grating used in terahertz detection techniques

Wang,

Liu

2024

Phys. Scr.

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As narrow-band pass filters are essential in terahertz(THz) applications, we present a ultra-narrow band filters based on silicon nitride subwavelength grating in this paper. Through rigorous coupled wave analysis, it can be seen that the main role of each structural factor or its influence on the spectral response characteristics are significantly different.Then, according to these laws, we get the design scheme by adjusting the structure factor of the subwavelength grating purposefully and pertinently. It can be seen from the results that the theoretical reflectance at 0.55 THz reaches 99.741%, and the half-peak frequency range is between −171MHz and +53 MHz. At the same time, the low sideband reflectance in the wide frequency band range of 0.2–0.8 THz indicates that the design can be used well for 0.55 THz signal in related THz detection technology.

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Section: Introductionmentioning

confidence: 99%

Research of ultra-narrow band filters based on silicon nitride subwavelength grating used in terahertz detection techniques

Wang,

Liu

2024

Phys. Scr.

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“…4 THz filters filtering out noise and centralizing the signal thus play a critical role. Comparing with the broad line width of Fabry−Perot (F−P) filters 5 and unavoidable Ohmic loss of frequency selective surface filters, 6 the guided-mode resonance filter (GMRF) adopting an all-dielectric structure, narrow line width, and high filtering efficiency has great application prospects and research values in THz applications. 7−11 A tunable GMRF having advantages of an extended applicable spectrum range is usually accomplished through changing the incident angle, 12 azimuthal angle, 13,14 and grating period.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Terahertz Guided-Mode Resonance Filter for Broadband Tunability

Miao,

Wei,

et al. 2024

ACS Appl. Polym. Mater.

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A guided-mode resonance filter (GMRF) in the terahertz (THz) band gaining narrow line width is a vigorous approach for THz biosensing and imaging. Limited by accessible low-loss materials above 1 THz, fabrication techniques, and tuning methods, a dynamically tunable THz GMRF implementing broad frequency range tunability faces great challenges. Here, by nanoimprinting a THz low-loss elastomer styrene−butadiene−styrene (SBS) film, we propose a dynamically tunable waveguide grating structure with an expanded work frequency. Utilizing simple tension field control and Poisson's ratio of elastomer, remarkable blueshift and redshift tunability could both be realized. When the SBS GMRF was elongated along the grating lines, a blueshift occurred from 2.63 to 3.29 THz under 300% strain. While applying perpendicular stretching, the redshift dramatically spanned 3.72 THz under 150% strain, presenting prominent strain sensitivity. Additionally, the microscopic phase separation of SBS makes it exhibit the characteristics of shape memory; hence, the cyclically stretched SBS GMRF maintained stable mechanical and optical performance. Hence, the elastic and shape reversible SBS-based GMRF will be a brilliant strategy for a tunable THz optical device.

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Terahertz narrow bandpass filters based on double-layer metallic woven meshes with engineered Fabry-Perot cavities

Cited by 2 publications

References 30 publications

Research of ultra-narrow band filters based on silicon nitride subwavelength grating used in terahertz detection techniques

Research of ultra-narrow band filters based on silicon nitride subwavelength grating used in terahertz detection techniques

Dynamic Terahertz Guided-Mode Resonance Filter for Broadband Tunability

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