Toxic chemical compound detection by terahertz spectroscopy: a review

Liu, Yang; Guo, Tengxiao; Zhang, Xu; Cao, Shi-Jie; Ding, Xuequan

doi:10.1515/revac-2017-0021

Cited by 53 publications

(27 citation statements)

References 32 publications

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“…When the analysis sample is overlaid on top of the metamaterial, the altered resonance response is converted into a significant change in the transmitted or reflected signal in the response spectrum, and these changes can be detected directly [18,21]. This is an effective method for determining the nature of an analytical sample, such as the quality center of certain organisms or chemicals [17,22]. In order to achieve this principle, many terahertz metamaterial biosensors with biodetection capabilities have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Tunable Dual-Band Ultrasensitive Stereo Metamaterial Terahertz Sensor

Cao

Wang

et al. 2020

IEEE Access

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To overcome the effect of analyte thickness and limitation of single wavelength sensing, we propose an ultra-sensitive stereo metamaterial biosensor with double resonance frequencies based on coupling electric resonance and magnetic resonance. The electromagnetic analysis demonstrates that the double resonance coupling, induced by the structural the stereo double-layer design, can significantly improve sensitive biosensing at the terahertz frequency. The results show that by changing the size of the structure, each resonance frequency can be independently tuned in the range of 0.5-1.8 THz and the maximum refractive index sensitivity is 930.4 GHz/RIU. These results have significant effects on the detection of samples with different frequency points. Our ultra-sensitive stereo metamaterial structure has unparalleled potential and application in biomolecule detection and differentiation.

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Section: Introductionmentioning

confidence: 99%

Tunable Dual-Band Ultrasensitive Stereo Metamaterial Terahertz Sensor

Cao

Wang

et al. 2020

IEEE Access

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“…TeraFET technology will also enable THz applications including astronomical science [ 133 , 134 , 135 ], earth observation [ 136 ], sensing [ 137 , 138 , 139 ], chemical analysis [ 140 , 141 ], homeland security, concealed weapon and explosive detection [ 142 , 143 ], industrial controls [ 144 , 145 ], compact radars [ 146 , 147 ], structural integrity testing, spacecraft tiles control [ 144 ], Internet of Things (IoT), biotechnology [ 148 , 149 , 150 ], medicine [ 151 , 152 ], including cancer diagnostics [ 153 ], and non-destructive VLSI testing during the manufacturing process [ 154 ] and in-situ checking of the THz scans of chips [ 155 , 156 , 157 , 158 , 159 ]. Artificial intelligence processing of the VLSI THz scans allows distinguishing between genuine and fake VLSI for hardware cyber security applications [ 158 ].…”

Section: Other Terafet Applicationsmentioning

confidence: 99%

Plasmonic Field-Effect Transistors (TeraFETs) for 6G Communications

Shur

Aǐzin

Otsuji

et al. 2021

Sensors

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Ever increasing demands of data traffic makes the transition to 6G communications in the 300 GHz band inevitable. Short-channel field-effect transistors (FETs) have demonstrated excellent potential for detection and generation of terahertz (THz) and sub-THz radiation. Such transistors (often referred to as TeraFETs) include short-channel silicon complementary metal oxide (CMOS). The ballistic and quasi-ballistic electron transport in the TeraFET channels determine the TeraFET response at the sub-THz and THz frequencies. TeraFET arrays could form plasmonic crystals with nanoscale unit cells smaller or comparable to the electron mean free path but with the overall dimensions comparable with the radiation wavelength. Such plasmonic crystals have a potential of supporting the transition to 6G communications. The oscillations of the electron density (plasma waves) in the FET channels determine the phase relations between the unit cells of a FET plasmonic crystal. Excited by the impinging radiation and rectified by the device nonlinearities, the plasma waves could detect both the radiation intensity and the phase enabling the line-of-sight terahertz (THz) detection, spectrometry, amplification, and generation for 6G communication.

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“…A recent review of toxic compound detection by THz spectroscopy by Yang et al [168] lists a wide range of gases studied. In a work focused on demonstrating selectivity, TDS was used to examine eight gases [169]: acetaldehyde, acetonitrile, ethanol, water, methanol, ammonia, propionaldehyde, and propionitrile.…”

Section: Gas Sensingmentioning

confidence: 99%