Towards remotely directional transmission of terahertz wave in air: The concept of free-space photonic crystal waveguide

Tang, Lie-Zhi; Zhao, Jiayu; Dong, Zhang-Hua; Liu, Zhonghui; Xiong, Wen-Ting; Hui, Yu-Chen; Shkurinov, A. P.; Peng, Yan; Zhu, Yiming

doi:10.1016/j.optlastec.2021.107102

Cited by 8 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Terahertz (THz) wave, between microwave and far-infrared band, is usually de ned as electromagnetic radiation from 0.1 to 10 THz [1]. Along with the rapid development of terahertz sources [2], terahertz detectors [3], and the research of terahertz functional devices [4][5][6][7][8][9], THz technology has developed rapidly in recent years, [10,11], and the ourishing of theoretical knowledge and device design in the three aspects of terahertz wave generation, transmission and detection [12][13][14]. Terahertz metamaterials and metasurfaces have also given terahertz technology a wide range of applications in imaging systems due to the advantages of subwavelength unit scale and exible manipulation of electromagnetic wave amplitude and phase [15].…”

Section: Introductionmentioning

confidence: 99%

Accurate inverse design for high-efficiency and broadband terahertz devices by co-simulation with genetic algorithms

Zhang

Cui

et al. 2023

Preprint

View full text Add to dashboard Cite

Terahertz (THz) waves have become a research hotspot in recent years due to their unique advantages, and metasurface-based devices in the terahertz band have outstanding practical applications as the core for the development of terahertz science and technology. However, with the increasing complexity of the metasurface structures, the design methods have become more and more difficult, which hinders the further practical application of terahertz metasurface devices. In this study, we combined MATLAB with the rigorous electromagnetic field simulation software CST (Computer Simulation Technology) to perform a co-simulation method for the design of high-efficiency and broadband THz metasurface devices. In the proposed design method, genetic algorithm (GA) is embedded to realize automatic and inverse design. Aiming to the different requirements of high-efficiency and broadband THz metasurface devices, different objective functions are set to optimize the design of different types of THz metasurface devices. As proofs-of-concept demonstration, three types of high efficiency and broadband THz metasurface devices have been designed by this method, including absorber, polarization convertor and frequency filter. After optimization by GA, we obtained dual metasurface absorber with absorbance of 90% in the range of 0.49 ~ 3.68 THz. The low-pass filter exhibits good filter property, and the polarization converter has a polarization conversion ratio (PCR) greater than 90% in the range of 0.69 ~ 1.52 THz. Based on the rigorous electromagnetic simulation and genetic algorithm, the proposed design method can realize automatic and inverse design with high reliability, compared to the theoretical model based on catenary e-field theory. This study provides an important guiding role and an efficient method for designing and optimizing required metasurface devices with practical applied value.

show abstract

Section: Introductionmentioning

confidence: 99%

Accurate inverse design for high-efficiency and broadband terahertz devices by co-simulation with genetic algorithms

Zhang

Cui

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The attenuation level measured at these frequencies was about 10 dB to 20 dB per meter [16]. This limitation led the researchers to research various transmission methods [17,18].…”

mentioning

confidence: 99%

Low Loss THz Waveguides and Its Potentials towards 6G Communication: A Brief Chronicle Review

Sohoo

2024

IJEETC

View full text Add to dashboard Cite

Advancement in technology has opened the doors for the terahertz (THz) frequency range to be applied in different fields for various applications. The future communication technology, especially 6G, will also intend to utilize the THz frequency band due to its large bandwidth that has the capabilities to achieve a high data rate. Great losses are presented in the early research into terahertz transmission medium. It is critical to design an appropriate waveguide that can integrate the THz waves into the system efficiently with minimum loss and provides the ease of transmission of data and overcomes the free space loss issues. Communication, sensing, and other application parameters are highly affected by transmission losses; therefore, low transmission loss and dispersion loss waveguide designs are required for proper utilization. In this paper, the review on reduction in the transmission loss in different types of waveguides operating at the Terahertz frequency range is studied. The design and the experimental setup for several classes of THz waveguides for minimizing transmission loss are also discussed. The review study shows that these waveguides can be a promising transmission medium for future 6G communication.

show abstract

Light-guiding-light-based temporal integration of broadband terahertz pulses in air

Zhao,

Zhu,

Han

et al. 2023

APL Photonics

View full text Add to dashboard Cite

The next generation of all-optical computation platforms prefers the light-guiding-light (LGL) scheme inside a medium that envisions circuitry-free and rapidly reconfigurable systems powered by dynamic interactions between light beams. Currently, suitable LGL materials and corresponding mechanisms are in urgent need. In this work, we proposed ubiquitous air as a restorable LGL signal manipulation medium with transient air-plasma waveguide circuits. Briefly, by focusing femtosecond laser beams in free space, the created atmospheric plasma filament array via photoionization was able to guide terahertz (THz) pulses along its epsilon-near-zero zone with a 1/f-profile spectral response. Consequently, this achieved a time-domain integration of the THz pulse in broad bandwidth. When the pumping laser was sequentially turned off and on, this air-plasma multi-filament structure was erased and rebuilt within nano- and femto-seconds, respectively, allowing rapid and repeated rearrangements of the all-optical stage. Furthermore, this air-based LGL information processing approach is promising to pave the way toward all-optical calculations during free-space directional transmission of THz waves, in which way the delivered THz signal can be remotely controlled.

show abstract

Towards remotely directional transmission of terahertz wave in air: The concept of free-space photonic crystal waveguide

Cited by 8 publications

References 41 publications

Accurate inverse design for high-efficiency and broadband terahertz devices by co-simulation with genetic algorithms

Accurate inverse design for high-efficiency and broadband terahertz devices by co-simulation with genetic algorithms

Low Loss THz Waveguides and Its Potentials towards 6G Communication: A Brief Chronicle Review

Light-guiding-light-based temporal integration of broadband terahertz pulses in air

Contact Info

Product

Resources

About