Biomedical applications of terahertz technology

Gong, Aiping; Qiu, Yating; Chen, Xiaowan; Zhao, Zhenyu; Xia, Lin; Shao, Yimin

doi:10.1080/05704928.2019.1670202

Cited by 123 publications

(57 citation statements)

References 41 publications

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“…Terahertz (THz) waves ranging from 0.1 to 10 THz show huge potential for application in communication [1], imaging [2,3], biomedicine [4][5][6][7][8], and chemistry [9][10][11][12]. The great prospects of THz technology inevitably stimulate further research on the cost-effective devices to manipulate the emission, propagation, modulation, and sensing of THz waves.…”

Section: Introductionmentioning

confidence: 99%

Tunable Fano Resonance and Enhanced Sensing in Terahertz Metamaterial

2021

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Fano resonances in metamaterial are important due to their low-loss subradiant behavior that allows excitation of high quality (Q) factor resonances extending from the microwave to the optical bands. Fano resonances have recently showed their great potential in the areas of modulation, filtering, and sensing for their extremely narrow linewidths. However, the Fano resonances in a metamaterial system arise from the interaction of all that form the structure, limiting the tunability of the resonances. Besides, sensing trace analytes using Fano resonances are still challenging. In the present work, we demonstrate the excitation of Fano resonances in metamaterial consisting of a period array of two concentric double-split-ring resonators with symmetry breaking (position asymmetry and gaps asymmetry). The tunability and sensing of Fano resonances are both studied in detail. Introducing position asymmetry in the metamaterial leads to one Fano resonance located at 0.50 THz, while introducing gaps asymmetry results in two Fano resonances located at 0.35 THz and 0.50 THz. The transmittance, position, and linewidth of the three Fano resonances can be easily tuned by varying the asymmetry deviations. The Q factor and figure of merit (FoM) of Fano resonances with different asymmetry deviations are calculated for performance optimization. The Fano resonances having the highest FoM are used for the sensing of analytes at different refractive indices, and the Fano resonance performing the best in refractive index sensing is further applied to detect the analyte thickness. The results demonstrate that the tunable Fano resonances show tremendous potential in sensing applications, offering an approach to engineering highly efficient modulators and sensors.

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Section: Introductionmentioning

confidence: 99%

Tunable Fano Resonance and Enhanced Sensing in Terahertz Metamaterial

2021

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“…Despite the fact that the occurrence of speckle-noise can affect negatively for some imaging techniques (e. g. optical coherence tomography and LIDAR technologies), there are fields in which usage of speckle patterns can be very promising: it applied for image retrieving in speckle metrology 3 , single pixel imaging 4 , for ghost imaging 5 – 8 , cryptography technique 9 etc. In turn, terahertz (THz) radiation, due to the optical properties of various materials in this frequency range, as well as the features of individual properties of the radiation itself, is becoming more popular in quality control systems 10 – 12 , safety 13 – 16 and biomedicine application 17 – 19 , communication 20 – 23 .…”

Section: Introductionmentioning

confidence: 99%

Speckle patterns formed by broadband terahertz radiation and their applications for ghost imaging

Leibov

Ismagilov

Zalipaev

et al. 2021

Sci Rep

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Speckle patterns can be very promising for many applications due to their unique properties. This paper presents the possibility of numerically and experimentally formation of speckle patterns using broadband THz radiation. Strong dependence of the statistical parameters of speckles, such as size and sharpness on the parameters of the diffuser are demonstrated: the correlation length and the mean square deviation of the phase surface inhomogeneity. As the surface correlation length is increasing, the speckle size also increases and its sharpness goes down. Alternatively, the magnification of the standard deviation of the surface height leads to the speckle size diminishing and growth of the speckle sharpness. The dimensions of the experimentally formed speckles correspond to the results of numerical simulation. The possibility of utilizing formed speckle patterns for the implementation of the ghost imaging technique has been demonstrated by methods of numerical modeling.

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“…The THz technology provides new research methods for the development of biomedical applications, antennas, chemistry, and many other disciplines. [6][7][8][9][10][11][12] Metamaterials have attracted much attention in recent years due to the flexible modulation and control of electromagnetic waves. Metamaterials are artificially synthesized material composed of structural unit cells.…”

Section: Introductionmentioning

confidence: 99%

The terahertz metamaterial sensor for imidacloprid detection

Yang

Uqaili

et al. 2021

Int J RF Microw Comput Aided Eng

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Imidacloprid has been widely used in crop pest control and disease resistance, the highly sensitive detection of imidacloprid concentration is strongly demanded in the field of food safety and the other fields. In this paper, a method to determine the concentration of imidacloprid by using the tablet instead of the liquid on a terahertz metamaterial sensor is proposed, which could avoid the influence of the water absorption in the terahertz band. The physical mechanism of the biosensing performance is verified theoretically and experimentally. It is found that the resonant frequency of the metamaterial has a red shift as the concentration of the imidacloprid tablet increases. The frequency shift is caused by the different concentrations as well as the refractive index of the imidacloprid tablet. The calculated sensitivity is 275.86 GHz/RIU and the figure of merit is 9.61. The proposed method would have important applications in the food safety industry.

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Biomedical applications of terahertz technology

Cited by 123 publications

References 41 publications

Tunable Fano Resonance and Enhanced Sensing in Terahertz Metamaterial

Tunable Fano Resonance and Enhanced Sensing in Terahertz Metamaterial

Speckle patterns formed by broadband terahertz radiation and their applications for ghost imaging

The terahertz metamaterial sensor for imidacloprid detection

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