Non-destructive terahertz imaging of illicit drugs using spectral fingerprints

Kawase, Kodo; Ogawa, Yuichi; Watanabe, Yuuki; Inoue, Hiroyuki

doi:10.1364/oe.11.002549

Cited by 1,242 publications

(511 citation statements)

References 7 publications

Supporting

Mentioning

504

Contrasting

Unclassified

Order By: Relevance

“…In recent years, terahertz (THz) imaging has captured significant interest because of it is potential for a wide range of applications such as bio-detection, 1 security screening, 2 illicit drug detection, 3 and skin cancer detection, 4 to name a few. In spite of the intense research activity, simple and low-cost THz imaging systems are still not a reality.…”

Section: Introductionmentioning

confidence: 99%

A low-voltage high-speed terahertz spatial light modulator using active metamaterial

Rout

Sonkusale

2016

APL Photonics

View full text Add to dashboard Cite

An all solid-state metamaterial based terahertz (THz) spatial light modulator (SLM) is presented which uses high mobility 2DEG to manipulate the metamaterial resonant frequency (0.45 THz) leading to terahertz wave modulation. The 2DEG is created by embedding pseudomorphic high-electron mobility transistors in the capacitive gap of each electrical-LC resonator, allowing the charge density to be controlled with very low voltage (1 V) and modulating speeds up to 10 MHz while consuming sub-milliwatt power. We have demonstrated our SLM as a 2 × 2 pixel array operating around 0.45 THz by raster scanning a 6 × 6 image of an occluded metal object behind a thick polystyrene screen using a single-pixel THz imaging setup.

show abstract

Section: Introductionmentioning

confidence: 99%

A low-voltage high-speed terahertz spatial light modulator using active metamaterial

Rout

Sonkusale

2016

APL Photonics

View full text Add to dashboard Cite

show abstract

“…THz-frequency radiation is a valuable tool in the characterization of doped semiconductors, whose typical electron relaxation rates and plasma frequencies are in this range 2,3 . Other uses of THz radiation include non-destructive imaging of samples that are too sensitive for x-rays, opaque at optical and near-infrared frequencies, but transparent to THz-frequency illumination 4,5 . Unfortunately, a lack of compact and efficient sources in this frequency range, referred to as the THz gap, is an impediment to the development and application of THzbased technologies 6 .…”

Section: Introductionmentioning

confidence: 99%

Coulomb-driven terahertz-frequency intrinsic current oscillations in a double-barrier tunneling structure

Jonasson

Knežević

2014

Phys. Rev. B

View full text Add to dashboard Cite

We investigate time-dependent, room-temperature quantum electronic transport in GaAs/AlGaAs double-barrier tunneling structures (DBTSs). The open-boundary Wigner-Boltzmann transport equation is solved by the stochastic ensemble Monte Carlo technique, coupled with Poisson's equation and including electron scattering with phonons and ionized dopants. We observe well-resolved and persistent THz-frequency current density oscillations in uniformly-doped, dc-biased DBTSs at room temperature. We show that the origin of these intrinsic current oscillations is not consistent with previously proposed models, which predicted an oscillation frequency given by the average energy difference between the quasi-bound states localized in the emitter and main quantum wells. Instead, the current oscillations are driven by the long-range Coulomb interactions, with the oscillation frequency determined by the ratio of the charges stored in the emitter and main quantum wells. We discuss the tunability of the frequency by varying the doping density and profile.

show abstract

“…[3][4][5] THz detectors are playing a key role in wide range of applications such as material identification, imaging, tomography, secured communication, medical detection. [6][7][8][9][10] It's necessary to develop terahertz detectors with high sensitivity, low coat, room temperature operating, and low complex characteristics.…”

Section: Introductionmentioning

confidence: 99%

Preparation of room temperature terahertz detector with lithium tantalate crystal and thin film

Wang¹,

Gou²,

Li³

2014

AIP Advances

View full text Add to dashboard Cite

Research on room temperature terahertz (THz) detector is essential for promoting the application of THz science and technology. Both lithium tantalate crystal (LiTaO3) and lithium tantalate thin film were used to fabricate the THz detector in this paper. Polishing process were used to reduce the thickness of LiTaO3 crystal slice by chemical mechanical polishing techniques and an improved sol-gel process was used to obtain high concentration LiTaO3 precursor solution to fabricate LiTaO3 thin film. Three dimension models of two THz detectors were set up and the temperature increasing map of two devices were simulated using finite element method. The lowest noise equivalent power value for terahertz detector using pyroelectric material reaches 6.8 × 10−9 W at 30 Hz operating frequency, which is suitable for THz imaging application.

show abstract

Non-destructive terahertz imaging of illicit drugs using spectral fingerprints

Cited by 1,242 publications

References 7 publications

A low-voltage high-speed terahertz spatial light modulator using active metamaterial

A low-voltage high-speed terahertz spatial light modulator using active metamaterial

Coulomb-driven terahertz-frequency intrinsic current oscillations in a double-barrier tunneling structure

Preparation of room temperature terahertz detector with lithium tantalate crystal and thin film

Contact Info

Product

Resources

About