Terahertz wave reference-free phase imaging for identification of explosives

Zhang, Liangliang; Zhong, Hua; Deng, Chao; Zhang, Cunlin; Zhao, Yuejin

doi:10.1063/1.2891082

Cited by 44 publications

(13 citation statements)

References 27 publications

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“…Gu et al presented a wide-band, polarization-insensitive, wide-angle terahertz metamaterial absorber [21]. These metamaterial absorbers show excellent absorption at terahertz frequencies, but they have only one single-band absorption response, which limits the potential application to spectroscopic detection and phase imaging of prohibited drugs and explosive materials that require distinct absorption or fingerprints at multifrequency [22,23]. To the best of our knowledge, currently there are only few articles reporting about multiband terahertz metamaterial absorber [24,25].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Terahertz Metamaterial Absorber With Polarization Insensitivity and Wide Incident Angle

He¹,

Wang²,

Wang³

et al. 2011

PIER

103

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Abstract-This paper presents the design, simulation and measurement of a dual-band terahertz metamaterial absorber with polarization-insensitivity and wide incident angle. The unit cell of the metamaterial consists of top resonator structures and low metallic ground plane, separated by an isolation material spacer to realize both electric and magnetic resonances. The physical mechanism of dual-band absorption and the sensitivity to the polarization direction and incident direction of the EM wave are theoretically investigated by simulating the x-component and normal component electric field distribution, current distribution on ERRs and metallic ground plane, and distribution of power flow and loss at the resonance frequencies as well as different modes EM waves, based the FDTD calculated method, respectively. The results show that the absorber is not only correctly coupling to the incident electric field and magnetic field, but also can trap the input power into specific positions of the devices and absorb it, besides insensitivity to the polarized angle and incident angle. Moreover, the experiment demonstrates that the absorber achieves two strong absorptions of 82.8% and 86.8% near 1.724 and 3.557 THz.

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Section: Introductionmentioning

confidence: 99%

Dual-Band Terahertz Metamaterial Absorber With Polarization Insensitivity and Wide Incident Angle

He¹,

Wang²,

Wang³

et al. 2011

PIER

103

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“…where is the refractive index for the frequency at the point with coordinates , is the extinction coefficient at the same point, and and are the amplitudes of hologram and background reconstructed wavefronts, correspondingly. iii) If it is supposed that the object contains several materials featuring strongly distinguished differences in their THz absorption lines (e.g., explosives [41] or drugs [42]), THz PTDH will allow determining the lateral distribution of all concealed matter within the sample. It is possible because thickness derivation from the recovered wavefront at different frequencies will show discrepancies only at characteristic spectral lines where the odd material is located in the object.…”

Section: Thz Ptdh Applicationsmentioning

confidence: 99%

“…Among all existing pulsed THz imaging techniques, the particular niche is occupied by methods based on the standard THz time-domain spectroscopy (THz-TDS) [8], and one of the reasons for this is the possibility to provide information on materials' spectral features in THz region [9]. However, despite the fact that they allow obtaining phase reconstruction, most widespread raster scanning THz-TDS systems suffer from restricted lateral resolution determined by the transverse size of the THz focused waist.…”

mentioning

confidence: 99%

Application of Terahertz Pulse Time-Domain Holography for Phase Imaging

Petrov

Kulya

Tsypkin

et al. 2016

IEEE Trans. THz Sci. Technol.

103

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Terahertz pulse time-domain holography (THz PTDH) is the powerful technique for high-resolution amplitude and phase THz imaging that allows mapping spectroscopic information across the imaged object. In this paper, we consider most sought after applications of phase imaging provided by this technique and experimentally demonstrate the ability of the method to reconstruct smooth and stepped relief features of an object that is transparent in THz region. Unlike the amplitude distribution, which does not contain any significant information in this case, phase distribution not only reveals the object qualitatively, but also allows the reconstruction of the object thicknesses pattern, even in low signal-to-noise registration conditions. Main limitations of the proposed method, such as transverse resolution and low signal-to-noise environment are carefully studied and mitigated.

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“…Meanwhile, terahertz time-domain spectroscopy has been widely applied to investigate the optical properties of different materials, such as biological tissues [6] , chemical [7] and explosive materials [8] , as the development of terahertz generation and detection techniques. By now there is strong demand to develop innovative functional components for intense and broadband terahertz wave.…”

Section: Introductionmentioning

confidence: 99%

Ultra-broadband terahertz spectroscopy of InP wafer using coherent heterodyne time domain spectrometer

Zhang

2015

SPIE Proceedings

Self Cite

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Indium Phosphide (InP) has attracted great physical interest because of its unique characteristics and is indispensable to both optical and electronic devices. In this paper, we study the optical properties of undoped (100) InP wafer in the ultra-broad terahertz frequency range (0.5-18 THz) by using air-biased-coherent-detection (ABCD) system. It is observed that InP wafer is opaque at the frequencies spanning from 6.7 THz to 12.1 THz. In the frequency regions of 0.8-6.7 THz and 12.1-18 THz it has relatively low absorption coefficient. Meanwhile, the refractive index increases monotonously in the 0.8-6.7 THz region and 12.1-18 THz region. These findings will contribute to the design of InP based component for nonlinear terahertz devices.

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Terahertz wave reference-free phase imaging for identification of explosives

Cited by 44 publications

References 27 publications

Dual-Band Terahertz Metamaterial Absorber With Polarization Insensitivity and Wide Incident Angle

Dual-Band Terahertz Metamaterial Absorber With Polarization Insensitivity and Wide Incident Angle

Application of Terahertz Pulse Time-Domain Holography for Phase Imaging

Ultra-broadband terahertz spectroscopy of InP wafer using coherent heterodyne time domain spectrometer

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