Fiber-wireless signal transport by terahertz waves

Terahertz waves are expected to be used in next-generation communications, detection, and other fields due to their unique characteristics. As a basic part of the terahertz application system, the terahertz detector plays a key role in terahertz technology. Due to the two-dimensional structure, graphene has unique characteristics features, such as exceptionally high electron mobility, zero band-gap, and frequency-independent spectral absorption, particularly in the terahertz region, making it a suitable material for terahertz detectors. In this review, the recent progress of graphene terahertz detectors related to photovoltaic effect (PV), photothermoelectric effect (PTE), bolometric effect, and plasma wave resonance are introduced and discussed.

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Assessing the Salt Constituents Characteristics in Aqueous Solutions Using Terahertz Waves

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting ◽

10.1109/ieeeconf35879.2020.9329818 ◽

2020 ◽

Author(s):

Adnan Zahid ◽

Hasan T. Abbas ◽

Ivonne E. Carranza ◽

James P. Grant ◽

Muhammad A. Imran ◽

...

Keyword(s):

Aqueous Solutions ◽

Terahertz Waves

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Frequency Division Multiplexing of Terahertz Waves Realized by Diffractive Optical Elements

Applied Sciences ◽

10.3390/app11146246 ◽

2021 ◽

Vol 11 (14) ◽

pp. 6246

Author(s):

Paweł Komorowski ◽

Patrycja Czerwińska ◽

Mateusz Kaluza ◽

Mateusz Surma ◽

Przemysław Zagrajek ◽

...

Keyword(s):

Frequency Division Multiplexing ◽

Diffractive Optical Elements ◽

Frequency Division ◽

Terahertz Waves ◽

Optical Elements ◽

Telecommunication Systems ◽

Wide Range ◽

The Future ◽

Wireless Telecommunication ◽

Finite Distance

Recently, one of the most commonly discussed applications of terahertz radiation is wireless telecommunication. It is believed that the future 6G systems will utilize this frequency range. Although the exact technology of future telecommunication systems is not yet known, it is certain that methods for increasing their bandwidth should be investigated in advance. In this paper, we present the diffractive optical elements for the frequency division multiplexing of terahertz waves. The structures have been designed as a combination of a binary phase grating and a converging diffractive lens. The grating allows for differentiating the frequencies, while the lens assures separation and focusing at the finite distance. Designed structures have been manufactured from polyamide PA12 using the SLS 3D printer and verified experimentally. Simulations and experimental results are shown for different focal lengths. Moreover, parallel data transmission is shown for two channels of different carrier frequencies propagating in the same optical path. The designed structure allowed for detecting both signals independently without observable crosstalk. The proposed diffractive elements can work in a wide range of terahertz and sub-terahertz frequencies, depending on the design assumptions. Therefore, they can be considered as an appealing solution, regardless of the band finally used by the future telecommunication systems.

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Wireless Signal Identification in 230MHz Band Based on Interference Cleaning and Convolutional Neural Network

Proceedings of the 2019 the 9th International Conference on Communication and Network Security ◽

10.1145/3371676.3371686 ◽

2019 ◽

Author(s):

Yucheng Wang ◽

Daohua Zhu ◽

Qing Wu ◽

Yajuan Guo ◽

Chonghai Yang ◽

...

Keyword(s):

Neural Network ◽

Convolutional Neural Network ◽

Signal Identification ◽

Wireless Signal

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Research progress in the effects of terahertz waves on biomacromolecules

Military Medical Research ◽

10.1186/s40779-021-00321-8 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Liu Sun ◽

Li Zhao ◽

Rui-Yun Peng

Keyword(s):

Vibrational Energy ◽

Rapid Development ◽

Energy Levels ◽

Basic Research ◽

Research Progress ◽

Biological Macromolecules ◽

Terahertz Waves ◽

Terahertz Spectrum ◽

Biomedical Field ◽

Vibrational Energy Levels

AbstractWith the rapid development of terahertz technologies, basic research and applications of terahertz waves in biomedicine have attracted increasing attention. The rotation and vibrational energy levels of biomacromolecules fall in the energy range of terahertz waves; thus, terahertz waves might interact with biomacromolecules. Therefore, terahertz waves have been widely applied to explore features of the terahertz spectrum of biomacromolecules. However, the effects of terahertz waves on biomacromolecules are largely unexplored. Although some progress has been reported, there are still numerous technical barriers to clarifying the relation between terahertz waves and biomacromolecules and to realizing the accurate regulation of biological macromolecules by terahertz waves. Therefore, further investigations should be conducted in the future. In this paper, we reviewed terahertz waves and their biomedical research advantages, applications of terahertz waves on biomacromolecules and the effects of terahertz waves on biomacromolecules. These findings will provide novel ideas and methods for the research and application of terahertz waves in the biomedical field.

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