Comparative study of real-time terahertz imaging of concealed metallic objects, drug, wood and TNT explosive in transmission/reflection modes using uncooled microbolometer and ultrafast pulsed terahertz imaging systems

Kumar, Prashant; Nagaraju, M.; Arjun, K. V.; Razdan, A. K.; Chaudhary, A.K.

doi:10.1007/s12648-023-02652-9

Cited by 5 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Utilizing the temporal pro les of the terahertz pulses, valuable information about the material properties, such as absorption, re ection, and transmission, can be extracted out. THz-TDS has a wide range of applications in basic science and applied sciences, such as non-contact characterization, imaging, concealed explosive detection, etc [5][6][7][8][9]. THz-TDS can either be performed in transmission mode or re ection mode.…”

Section: Introductionmentioning

confidence: 99%

Cross-correlation technique for phase error correction in reflection mode terahertz time-domain spectroscopy

Koalla,

Chaudhary

2024

Appl. Opt.

View full text Add to dashboard Cite

The Terahertz time-domain spectroscopy in re ection mode geometry provides valuable surface and subsurface information, making it suitable for layer analysis, coating, and non-destructive testing applications. The exchanging of position of sample and reference introduce a phase error when the position or alignment of the sample is not exactly maintained during measurements. This micrometre order of pitch error ( Δx) between the reference and the sample could lead to introduce inherent error in the phase spectrum of the sample. In the present work, a new novel approach based on cross-correlation technique has been demonstrated to solve the uncertainty in phase and to reveal the hidden characteristic features of the given sample in THz TDS spectroscopy. We illustrated and demonstrated the advantage of our approach by measuring the optical properties of Te on and RDX by correcting misalignment of 31.5 and 41.4 µm range, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Cross-correlation technique for phase error correction in reflection mode terahertz time-domain spectroscopy

Koalla,

Chaudhary

2024

Appl. Opt.

View full text Add to dashboard Cite

show abstract

“…Terahertz (THz) radiation refers to electromagnetic waves ranging from about 0.1 to 10 THz, which lie between the microwave and infrared regions. Terahertz radiation can penetrate a wide range of dielectric and semiconductor materials, such as plastics, textiles, ceramics, and paper, making them suitable for non-destructive evaluation, imaging, and sensing [1][2][3] . Terahertz metamaterials are artificially engineered materials with unique electromagnetic properties not found in natural materials.…”

Section: Introductionmentioning

confidence: 99%

Application of terahertz metamaterials for low-concentration sensing of premium explosives like RDX and TNT

Koalla,

Chaudhary,

Chowdhury

2024

Terahertz Photonics III

View full text Add to dashboard Cite

In the present study, we have studied the applicability of terahertz (THz) metamaterials for sensing low concentrations of premium explosives like RDX and TNT. A parallel metal-pair-based metamaterial has been investigated. The structure exhibits a Fano resonance at 0.627 THz in reflection geometry within the 0.1 to 1 THz range. The unit cell of the metamaterial comprises two asymmetric aluminium rod-like structures on an intrinsic silicon wafer with dimensions of 100 μm and 80 μm, respectively, and a silicon wafer thickness of 40 μm. The structure's periodicity is 120 μm along the x and y directions. We have also performed COMSOL-based simulations of metamaterial structures with different analyte thicknesses in conjunction with experimental verification. In the experiment, for an analyte thickness of 0.5 μm, the structure exhibits a refractive index-dependent sensitivity (S) of 5.1 GHz/RIU. For explosives, resonance peak shifts of 0.031 THz for TNT (refractive index 1.61) and 0.043 THz for RDX (refractive index 1.85) were observed from their respective resonance positions at 0.627 THz. These findings underscore the efficacy of THz metamaterials for detecting trace amounts of explosives.

show abstract

Real-time passive MMW/THz imaging system for concealed weapon detection

Ünal

2024

J Opt

View full text Add to dashboard Cite

Comparative study of real-time terahertz imaging of concealed metallic objects, drug, wood and TNT explosive in transmission/reflection modes using uncooled microbolometer and ultrafast pulsed terahertz imaging systems

Cited by 5 publications

References 20 publications

Cross-correlation technique for phase error correction in reflection mode terahertz time-domain spectroscopy

Cross-correlation technique for phase error correction in reflection mode terahertz time-domain spectroscopy

Application of terahertz metamaterials for low-concentration sensing of premium explosives like RDX and TNT

Real-time passive MMW/THz imaging system for concealed weapon detection

Contact Info

Product

Resources

About