Thursday, 21 June 2018
Tuesday, 19 June 2018
Locquet, A., J. Dong, M. Melis, and D. S. Citrin. "Terahertz pulsed imaging reveals the stratigraphy of a seventeenth-century oil painting." In Unconventional Optical Imaging, vol. 10677, p. 106771Z. International Society for Optics and Photonics, 2018.
Terahertz pulsed imaging has attracted considerable interest for revealing the stratigraphy and hidden features of art paintings. The reconstruction of the stratigraphy is based on the precise extraction of THz echo parameters from the reflected signals. Several historical panel paintings and wall paintings have been well studied by THz reflective imaging, in which the detailed stratigraphy has been successfully revealed. To our knowledge, however, the stratigraphy of oil paintings has not been clearly uncovered by THz imaging, since the paint layers in an oil painting on canvas, especially for the 16th and 17th century art works, are usually very thin (~10 μm) in the THz regime. Therefore, in order to improve the performance of THz imaging, advanced signal-processing techniques with higher depth-resolution are still needed. In this study, THz reflective imaging is employed to reveal for the first time the detailed stratigraphy of a 17th century Italian oil painting on canvas. The paint layers on the supporting canvas are very thin in the THz regime, as the THz echoes corresponding to the stratigraphy totally overlap in the first cycle of the reflected THz signal. THz sparse deconvolution based on an iterative shrinkage algorithm is utilized to resolve the overlapping echoes. Based on the deconvolved signals, the detailed stratigraphy of this oil painting on canvas, including the varnish, pictorial, underdrawing, and ground layers, is successfully revealed. The THz C- and B-scans based on the THz deconvolved signals also enable us to reveal the features of each layer. Our results thus enhance the capability of terahertz imaging to perform detailed analysis and diagnostics of historical oil paintings on canvas with foreseen applications for the study of the artist’s technique and for authentication.
for full paper see https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10677/106771Z/Terahertz-pulsed-imaging-reveals-the-stratigraphy-of-a-seventeenth-century/10.1117/12.2306771.short?SSO=1&tab=ArticleLink
Sahin, Seckin, Niru K. Nahar, and Kubilay Sertel. "Permittivity and Loss Characterization of SUEX Epoxy films for mmW and THz Applications." IEEE Transactions on Terahertz Science and Technology (2018).
We present a systematic characterization of the dielectric permittivity and loss tangent of SUEX dry films for mmW and THz bands. Green and cured SUEX samples of varying thicknesses were studied using two complementary measurement techniques. First, the Nicolson-Ross-Weir technique was used in a 2-port TE10 waveguide environment for 90-140 GHz and 140- 220 GHz bands. The samples were also characterized using a transmission-mode time domain THz spectrometer over the 90 GHz-2 THz band. Real part of permittivity and loss tangent were measured to be 3.08 and 0.057, respectively for the green SUEX sample. Ultra-violet light curing reduces the permittivity and loss tangent down to 2.86 and 0.020, respectively. SUEX films can be easily laminated onto any substrate, eliminating the spin coating and long process optimizations that are required for conventional liquid resists. As such, SUEX is an easy-to-process alternative to commonly used epoxy-based resists, such as SU- 8, while exhibiting similar dielectric permittivity and material losses.
A commercial THz TDS system (TPS Spectra 3000 from TeraView, Inc.) was utilized to obtain the transmission coefficient measurements of the SUEX samples …
for full paper see https://ieeexplore.ieee.org/abstract/document/8365846/
Monday, 18 June 2018
Cassar, Quentin, Amel Al-Ibadi, Laven Mavarani, Philipp Hillger, Janusz Grzyb, Gaëtan MacGrogan, Thomas Zimmer, Ullrich R. Pfeiffer, Jean-Paul Guillet, and Patrick Mounaix. "Pilot study of freshly excised breast tissue response in the 300–600 GHz range." Biomedical Optics Express 9, no. 7 (2018): 2930-2942.
The failure to accurately define tumor margins during breast conserving surgery (BCS) results in a 20% re-excision rate. The present paper reports the investigation to evaluate the potential of terahertz imaging for breast tissue recognition within the underexplored 300–600 GHz range. Such a frequency window matches new BiCMOS technology capabilities and thus opens up the opportunity for near-field terahertz imaging using these devices. To assess the efficacy of this frequency band, data from 16 freshly excised breast tissue samples were collected and analyzed directly after excision. Complex refractive indices have been extracted over the as-mentioned frequency band, and amplitude frequency images show some contrast between tissue types. Principal component analysis (PCA) has also been applied to the data in an attempt to automate tissue classification. Our observations suggest that the dielectric response could potentially provide contrast for breast tissue recognition within the 300–600 GHz range. These results open the way for silicon-based terahertz subwavelength near field imager design, efficient up to 600 GHz to address ex vivo lifescience applications.
… interface delimitation tool. 2. Methods 2.1 Acquisition set-up A commercially available TeraPulse 4000 (Teraview Ltd, Cambridge, UK), with a modified reflection geometry shown in Fig. 1, was used in this study. THz pulses are …
for full paper see https://www.osapublishing.org/DirectPDFAccess/C0FACBEC-D24C-2BB6-FE19B240275EDEC2_390258/boe-9-7-2930.pdf?da=1&id=390258&seq=0&mobile=no
Song, Chao, Wen-Hui Fan, Ling Ding, Xu Chen, Ze-You Chen, and Kai Wang. "Terahertz and infrared characteristic absorption spectra of aqueous glucose and fructose solutions." Scientific Reports 8, no. 1 (2018): 8964.
In this paper, the terahertz (THz) and infrared (IR) characteristic absorption spectra of aqueous glucose solutions and aqueous fructose solutions with different concentrations were measured and studied. The absorption spectra of these two molecules in solid-state and in aqueous solutions were compared and analyzed, the significant effect of molecular adjacent environment on the molecular structure and vibrational mode was revealed. In addition, the THz and IR absorption spectra of these two isomers’ aqueous solutions were also compared and explored. No obvious differences were found from their IR absorption features measured at room temperature, while their THz absorption spectra do have the differences, indicating THz characteristic absorption spectra more suitable for the detection and identification of aqueous glucose and fructose solutions. The results are helpful to understand the influence of aqueous solutions environment on the molecular structures and vibrational modes of the materials, and also provide a theoretical reference for the quantum chemical calculation of biological macromolecules.
… below 1%. Experimental apparatus. The THz absorption spectra of samples were measured by using a TPS-3000 spectrometer (TeraView Ltd., UK) 22 in the range of 0.1–4.0 THz with frequency resolution of 0.03 THz. The IR.........
For full paper see https://www.nature.com/articles/s41598-018-27310-7