SPP-assisted sub-wavelength reflection-type THz imaging with THz time-domain spectrometer

2017 ◽  
Author(s):  
Senfeng Lai ◽  
Yanghui Wu ◽  
Wen Wu ◽  
Wenhua Gu
Keyword(s):  
Time Domain ◽  
Thz Imaging ◽  
Sub Wavelength

Sub-Wavelength THz Imaging of the Domains in Periodically Poled Crystals Through Optical Rectification

2020 ◽  
Vol 41 (9) ◽  
pp. 1144-1154
Author(s):  
Gizem Soylu ◽  
Emilie Hérault ◽  
Benoît Boulanger ◽  
Fredrik Laurell ◽  
Jean-Louis Coutaz
Keyword(s):  
Optical Rectification ◽  
Thz Imaging ◽  
Periodically Poled ◽  
Sub Wavelength ◽  
Periodically Poled Crystals

scholarly journals Fiber Coupled Transceiver with 6.5 THz Bandwidth for Terahertz Time-Domain Spectroscopy in Reflection Geometry

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2616 ◽  
Author(s):  
Robert B. Kohlhaas ◽  
Lars Liebermeister ◽  
Steffen Breuer ◽  
Marcel Amberg ◽  
David de Felipe ◽  
...  
Keyword(s):  
Time Domain ◽  
Molecular Beam ◽  
Dynamic Range ◽  
High Mobility ◽  
Thz Imaging ◽  
Terahertz Time Domain Spectroscopy ◽  
Monolithically Integrated ◽  
Sensing Applications ◽  
Reflection Geometry ◽  
Thz Sensing

We present a fiber coupled transceiver head for terahertz (THz) time-domain reflection measurements. The monolithically integrated transceiver chip is based on iron (Fe) doped In0.53Ga0.47As (InGaAs:Fe) grown by molecular beam epitaxy. Due to its ultrashort electron lifetime and high mobility, InGaAs:Fe is very well suited as both THz emitter and receiver. A record THz bandwidth of 6.5 THz and a peak dynamic range of up to 75 dB are achieved. In addition, we present THz imaging in reflection geometry with a spatial resolution as good as 130 µm. Hence, this THz transceiver is a promising device for industrial THz sensing applications.

Application of Terahertz Spectroscopy and Imaging

2010 ◽  
Vol 5 (4) ◽  
pp. 123-129
Author(s):  
Mu Kaijun ◽  
Zhang Cunlin
Keyword(s):  
Time Domain ◽  
Quartz Crystal ◽  
Terahertz Spectroscopy ◽  
Thz Radiation ◽  
Radiation Polarization ◽  
Air Plasma ◽  
Thz Imaging ◽  
Terahertz Time Domain Spectroscopy ◽  
Security Applications ◽  
Angle Of Rotation

We examined the feasibility of Terahertz time-domain spectroscopy (THz-TDS) using a 4-mm-thick quartz crystal to extract the angle of rotation of THz radiation polarization induced by a two-color laser in air plasma. We also used the THz-TDS technique to identify explosives and melamine in mixtures. In addition, we presented a new opto-mechanical scanner for security applications using the method of passive THz imaging

THz imaging in the frame of the Archaeological Urban Park of Naples project

2020 ◽  
Author(s):  
Ilaria Catapano ◽  
Carlo Noviello ◽  
Giovanni Ludeno
Keyword(s):  
Data Processing ◽  
Cultural Heritage ◽  
Time Domain ◽  
Imaging Techniques ◽  
Urban Park ◽  
Thz Imaging ◽  
Terahertz Waves ◽  
Non Invasive ◽  
Processing Chain ◽  
Molecular Stability

<p>The Archaeological Urban Park of Naples (PAUN) project aims at addressing the need of analytical information relating to cultural heritage with modalities that encourage innovation systems of protection and enhancement. In this frame, one of the specific goals is the testing of multiple non-invasive or only minimally invasive investigation techniques, aimed at identifying a permanent diagnostic system calibrated to the specific context of the Urban Archaeological Park of Piazza Municipio, Napoli, Italy.</p><p>Among the electromagnetic sensing technologies, those exploiting Terahertz waves (1THz = 10<sup>12</sup> Hz) are the newest among the imaging techniques, which offers the attractive chance of characterizing the inner features of manmade objects with a sub-millimeter spatial resolution in a non-invasive way while assuring negligible long-term risks to the molecular stability of the exposed objects.</p><p>This possibility together with the recent development of compact, transportable and easily reconfigurable devices make THz imaging a more and more widespread considered investigation tool in the frame of cultural heritage. THz imaging allows, indeed, the gaining of information useful to improve knowledge about the design technique adopted by the artist and to detect possible damages affecting the conservation state of precious artworks [1].</p><p>In the frame of PAUN project, THz imaging is considered as part of the sensor network, which is dedicated to the material characterization and supports the conservation and use of the assets of the Urban Archaeological Park of Piazza Municipio. Specifically, THz imaging is adopted to analyze ancient decorated mortar specimens and gather information on their stratigraphy. At this regard, it is worth pointing out that the effectiveness of THz imaging, i.e. the capability of obtaining high resolution images of the object under test, is dependent not only on the performances of the hardware technology but also on the data processing approaches. Herein, we consider the time domain Z-Omega Fiber-Coupled Terahertz Time Domain (FICO) system, which is available at IREA-CNR, and a data processing chain specifically designed to improve the discrimination of different material layers and to reconstruct the inner features characterizing the investigated artworks [2].</p><p> </p><p>[1] Fukunaga, THz Technology Applied to Cultural Heritage in Practice, Cultural Heritage Science, Springer.</p><p>[2] Catapano, I., Soldovieri, F. A Data Processing Chain for Terahertz Imaging and Its Use in Artwork Diagnostics. J Infrared Milli Terahz Waves 38, 518–530 (2017).</p><p> </p><p>Acknowledge: Authors would like to thank the PAUN project “Archaeological Urban Park of Naples” by which the present work has been financed.</p><p> </p>

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