Design, simulation and fabrication of a new terahertz cross-shaped metamaterial bandpass filter to obtain a narrow frequency bandwidth

Shahounvand, Hojatollah; Fard, Azim; Tavakoli, Mahdi

doi:10.1007/s11082-021-03502-w

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…Multiple narrowband transmissions are excited. Especially, when the defect length is 0.3Λ, the full width at half height of mode C is only 2 MHz, and the calculated Q factor is close to 7.44 × 10 5 , which is at least three orders of magnitude higher than that of the reported THz metasurfaces [49], metamaterials [50], photonic crystals [51] and periodic waveguides [52]. The detailed comparison is shown in table 2.…”

Section: Frequency Shift Of Defect Modesmentioning

confidence: 79%

Antisymmetric localization of terahertz defect modes in a planar waveguide with undulated walls

Ma¹,

Liu²,

Zhang³

et al. 2022

Phys. Scr.

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Although various terahertz (THz) functional devices based on artificial materials have been widely proposed, their performance is still unsatisfactory due to the limitation of the involved guided wave modes. The introduction of defects can result in a strong localization effect, which has been found in applications of improving device performance. Due to Bragg resonances, the localization is usually symmetrical about the center of defects. Here, based on multiple mode resonances, we demonstrate an antisymmetric localization of THz waves in a periodic parallel plate waveguide with non-Bragg nature resonances. Unexpectedly, such resonances can produce two extremely narrow transmissions with a transmittance close to 1, and the narrowest linewidth can reach 2 MHz and the Q-factor is close to 7.5×105, which would be good candidates for THz filtering and sensing. Referring to the field distributions, we employ the mathematical operation symbols of the equal sign “=” and the multiplication sign “×” to intuitively mark these two antisymmetric localizations with different characteristics. The dispersion curves and mode analysis reveal that the observed antisymmetric localizations caused by non-Bragg resonances are induced by the first- and second-order transverse modes. Furthermore, the frequency of antisymmetric localizations can be manipulated by changing the geometry of defects. Our findings on extremely narrow transmission peaks and antisymmetric localizations pave a way for creating high performance THz functional devices, such as switches, filters, and sensors.

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Section: Frequency Shift Of Defect Modesmentioning

confidence: 79%

Antisymmetric localization of terahertz defect modes in a planar waveguide with undulated walls

Ma¹,

Liu²,

Zhang³

et al. 2022

Phys. Scr.

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A new design of ultra-thin wide stop-band metamaterial filter for terahertz waves

et al. 2023

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Metal-mesh linear variable bandpass filter for far-infrared wavelengths

Perido,

Denis,

Clancy

et al. 2024

Appl. Opt.

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Future far-infrared (IR) observatories require compact and cost efficient optical linear variable bandpass filters (LVBFs) to define their instrument spectral bands. We have designed novel far-IR LVBFs, to our knowledge, that consist of metal-mesh bandpass filters comprising a gold film with cross-slots of varying sizes along a silicon (Si) substrate with anti-reflection (AR) coatings. We present our work on the simulated and measured transmission of non-AR coated and AR coated LVBFs for bandpass peaks from wavelengths of 24 to 36 µm with a resolving power (R=λ0/Δλ) of R≈6 for non-AR coated LVBFs and R≈4 for AR coated LVBFs. We also present a method to decrease the effects of out-of-band high-frequency transmission exhibited by metal-mesh filters by depositing a thin layer of hydrogenated amorphous silicon (a-Si:H) on the metal-mesh of the LVBF. We have fabricated and measured the LVBFs at room temperature and cryogenic temperatures (5 K). We measure a high peak transmission of ∼80%−90% for the AR coated LVBF at 5 K and demonstrate that the a-Si:H LVBF is a promising method to address out-of-band high-frequency transmission.

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Design, simulation and fabrication of a new terahertz cross-shaped metamaterial bandpass filter to obtain a narrow frequency bandwidth

Cited by 3 publications

References 19 publications

Antisymmetric localization of terahertz defect modes in a planar waveguide with undulated walls

Antisymmetric localization of terahertz defect modes in a planar waveguide with undulated walls

A new design of ultra-thin wide stop-band metamaterial filter for terahertz waves

Metal-mesh linear variable bandpass filter for far-infrared wavelengths

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