Terahertz imaging: applications and perspectives

Jansen, Christian; Wietzke, Steffen; Peters, Ole; Scheller, Maik; Vieweg, N.; Salhi, Mohammed; Krumbholz, N.; Jördens, C.; Hochrein, Thomas; Koch, Martin

doi:10.1364/ao.49.000e48

Cited by 425 publications

(196 citation statements)

References 61 publications

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“…[1][2][3][4] One of those unique features is the spectral fingerprint that many materials possess in these frequencies, 5,6 which can be exploited for nondestructive imaging applications such as biomedical, materials inspection, and security. [7][8][9] Therefore, high spatial resolution imaging at a specific frequency of interest is a highly desirable capability in THz imaging applications.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of spatial resolution of terahertz imaging systems based on terajet generation by dielectric cube

et al. 2017

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The terahertz (THz, 0.1–10 THz) region has been attracting tremendous research interest owing to its potential in practical applications such as biomedical, material inspection, and nondestructive imaging. Those applications require enhancing the spatial resolution at a specific frequency of interest. A variety of resolution-enhancement techniques have been proposed, such as near-field scanning probes, surface plasmons, and aspheric lenses. Here, we demonstrate for the first time that a mesoscale dielectric cube can be exploited as a novel resolution enhancer by simply placing it at the focused imaging point of a continuous wave THz imaging system. The operating principle of this enhancer is based on the generation—by the dielectric cuboid—of the so-called terajet, a photonic jet in the THz region. A subwavelength hotspot is obtained by placing a Teflon cube, with a 1.46 refractive index, at the imaging point of the imaging system, regardless of the numerical aperture (NA). The generated terajet at 125 GHz is experimentally characterized, using our unique THz-wave visualization system. The full width at half maximum (FWHM) of the hotspot obtained by placing the enhancer at the focal point of a mirror with a measured NA of 0.55 is approximately 0.55λ, which is even better than the FWHM obtained by a conventional focusing device with the ideal maximum numerical aperture (NA = 1) in air. Nondestructive subwavelength-resolution imaging demonstrations of a Suica integrated circuit card, which is used as a common fare card for trains in Japan, and an aluminum plate with 0.63λ trenches are presented. The amplitude and phase images obtained with the enhancer at 125 GHz can clearly resolve both the air-trenches on the aluminum plate and the card’s inner electronic circuitry, whereas the images obtained without the enhancer are blurred because of insufficient resolution. An increase of the image contrast by a factor of 4.4 was also obtained using the enhancer.

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Section: Introductionmentioning

confidence: 99%

Enhancement of spatial resolution of terahertz imaging systems based on terajet generation by dielectric cube

et al. 2017

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“…Recently, there has been an increased interest in terahertz (THz) and sub mm-wave systems for imaging and extreme wide bandwidth communications [1,2]. Being nearly unused, the frequency range starting from 280 GHz has no bandwidth-allocation limitations and therefore has the potential to allow ultra-fast data rates projected beyond 100 Gbps for short range communication applications [3].…”

Section: Introductionmentioning

confidence: 99%

Wide modulation bandwidth terahertz detection in 130 nm CMOS technology

Nahar

Shafee

Blin

et al. 2016

Eur. Phys. J. Appl. Phys.

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Abstract. Design, manufacturing and measurements results for silicon plasma wave transistors based wireless communication wideband receivers operating at 300 GHz carrier frequency are presented. We show the possibility of Si-CMOS based integrated circuits, in which by: (i) specific physics based plasma wave transistor design allowing impedance matching to the antenna and the amplifier, (ii) engineering the shape of the patch antenna through a stacked resonator approach and (iii) applying bandwidth enhancement strategies to the design of integrated broadband amplifier, we achieve an integrated circuit of the 300 GHz carrier frequency receiver for wireless wideband operation up to/over 10 GHz. This is, to the best of our knowledge, the first demonstration of low cost 130 nm Si-CMOS technology, plasma wave transistors based fast/wideband integrated receiver operating at 300 GHz atmospheric window. These results pave the way towards future large scale (cost effective) silicon technology based terahertz wireless communication receivers.

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“…Today, the pursue for integrated and cost-effective generation and detection technologies that could allow a widespread access to the potential applications in the sub-THz and THz frequencies has become one of the most active fields of research [1,2]. A narrow linewidth of the sub-THz signals, in addition to cost and compactness of the proposed solutions, is needed for some of the applications, such as high resolution spectroscopy [2] or broad bandwidth communications [3]; but especially towards the development of heterodyne receivers in this frequency band, where a good quality Local Oscillator (LO) signal is mandatory.…”

Section: Introductionmentioning

confidence: 99%

“…A narrow linewidth of the sub-THz signals, in addition to cost and compactness of the proposed solutions, is needed for some of the applications, such as high resolution spectroscopy [2] or broad bandwidth communications [3]; but especially towards the development of heterodyne receivers in this frequency band, where a good quality Local Oscillator (LO) signal is mandatory.…”

Section: Introductionmentioning

confidence: 99%