Development of narrow bandpass filters based on cross cavities for the terahertz frequency range

Soboleva, V. Yu.; Gomon, D.; Седых, Е. А.; Balya, V. K.; Khodzitskiĭ, M. K.

doi:10.1364/jot.84.000521

Cited by 15 publications

(3 citation statements)

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“…The value of d changes at the distances λ, λ / 2 and λ / 4 from the central wavelength (resonance wavelength). As observed, the maximum reduction in the frequency bandwidth is obtained in the λ / 2 mode, which is about half the frequency bandwidth of the initial state (single filter) (Figure 5) [5,[17][18][19].…”

Section: Filter Structure and The Resultssupporting

confidence: 58%

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

2022

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Section: Filter Structure and The Resultssupporting

confidence: 58%

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

2022

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“…There is almost exact coincidence between simulated and experimental dispersions. In order to impart a frequency-dependent response, periodical cross-like apertures were made in the bismuth film in accordance with one of the standard configurations of frequency-selective surfaces with a polarization-independent electromagnetic response [49]. The scheme of this FSS is depicted in Figure 5a.…”

Section: Resultsmentioning

confidence: 99%

Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium

et al. 2023

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Negative group delay may be observed in dispersive media with anomalous dispersion in a certain frequency range. The fact that an outgoing wave packet precedes an incoming one does not violate the causality principle but is only a consequence of a waveform reshaping. This effect is observed in media such as photonic crystals, hyperbolic and epsilon-near-zero metamaterials, undersized waveguides, subwavelength apertures, side-by-side prisms, and resonant circuits at various frequencies. The current work is devoted to the design of a simple negative-group-delay medium with tunable properties in the THz frequency range. This medium consists of a bismuth-based frequency-selective surface on a dielectric substrate and may be tuned both statically and dynamically. While a geometry variation defines a main form of an effective permittivity dispersion and group delay/group velocity spectra, an external voltage allows one to adjust them with high precision. For the configuration proposed in this work, all frequency regions with noticeable change in group delay/group velocity lie within atmospheric transparency windows, which are to be used in 6G communications. This medium may be applied to THz photonics for a tunable phase-shift compensation, dispersion management in systems of THz signal modulation, and for encoding in next-generation wireless communication systems.

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“…2a. 37,38 A fs infrared laser pulse was split into two beams with the ratio of 1 : 9. The "probe beam" contained 10% of the energy and the "pump beam" -90%.…”

Section: Resultsmentioning

confidence: 99%

Optically controlled dielectric properties of single-walled carbon nanotubes for terahertz wave applications

et al. 2018

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Materials with tunable dielectric properties are valuable for a wide range of electronic devices, but are often lossy at terahertz frequencies. Here we experimentally report the tuning of the dielectric properties of single-walled carbon nanotubes under light illumination. The effect is demonstrated by measurements of impedance variations at low frequency as well as complex dielectric constant variations in the wide frequency range of 0.1-1 THz by time domain spectroscopy. We show that the dielectric constant is significantly modified for varying light intensities. The effect is also practically applied to phase shifters based on dielectric rod waveguides, loaded with carbon nanotube layers. The carbon nanotubes are used as tunable impedance surface controlled by light illumination, in the frequency range of 75-500 GHz. These results suggest that the effect of dielectric constant tuning with light, accompanied by low transmission losses of the carbon nanotube layer in such an ultra-wide band, may open up new directions for the design and fabrication of novel Terahertz and optoelectronic devices.

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Development of narrow bandpass filters based on cross cavities for the terahertz frequency range

Cited by 15 publications

References 0 publications

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

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

Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium

Optically controlled dielectric properties of single-walled carbon nanotubes for terahertz wave applications

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