Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/5/501 |
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| author | Anton D. Zaitsev Petr S. Demchenko Natallya S. Kablukova Anna V. Vozianova Mikhail K. Khodzitsky |
| author_facet | Anton D. Zaitsev Petr S. Demchenko Natallya S. Kablukova Anna V. Vozianova Mikhail K. Khodzitsky |
| author_sort | Anton D. Zaitsev |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T03:23:29Z |
| format | Article |
| id | doaj.art-7f55e2fda27848708cc8fcd2d0b71634 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-11T03:23:29Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-7f55e2fda27848708cc8fcd2d0b716342023-11-18T02:53:42ZengMDPI AGPhotonics2304-67322023-04-0110550110.3390/photonics10050501Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica MediumAnton D. Zaitsev0Petr S. Demchenko1Natallya S. Kablukova2Anna V. Vozianova3Mikhail K. Khodzitsky4ITMO University, 197101 St. Petersburg, RussiaITMO University, 197101 St. Petersburg, RussiaITMO University, 197101 St. Petersburg, RussiaITMO University, 197101 St. Petersburg, RussiaTydex LLC, 194292 St. Petersburg, RussiaNegative 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.https://www.mdpi.com/2304-6732/10/5/501anomalous dispersionbismuthfrequency-selective surface (FSS)negative group delay (NGD)numerical simulationterahertz time-domain spectroscopy (THz TDS) |
| spellingShingle | Anton D. Zaitsev Petr S. Demchenko Natallya S. Kablukova Anna V. Vozianova Mikhail K. Khodzitsky Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium Photonics anomalous dispersion bismuth frequency-selective surface (FSS) negative group delay (NGD) numerical simulation terahertz time-domain spectroscopy (THz TDS) |
| title | Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium |
| title_full | Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium |
| title_fullStr | Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium |
| title_full_unstemmed | Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium |
| title_short | Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium |
| title_sort | frequency selective surface based on negative group delay bismuth mica medium |
| topic | anomalous dispersion bismuth frequency-selective surface (FSS) negative group delay (NGD) numerical simulation terahertz time-domain spectroscopy (THz TDS) |
| url | https://www.mdpi.com/2304-6732/10/5/501 |
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