Tuesday, 18 June 2019
Romanenko, Sergii, Alan R. Harvey, Livia Hool, Shuting Fan, and Vincent P. Wallace. "Millimeter Wave Radiation Activates Leech Nociceptors via TRPV1-Like Receptor Sensitization." Biophysical journal (2019).
Thursday, 25 April 2019
Surma, Mateusz, Izabela Ducin, Maciej Sypek, Przemyslaw Zagrajek, and Agnieszka Siemion. "Optimization of THz diffractive optical elements thickness." Photonics Letters of Poland 10, no. 4 (2018): 115-117.
Diffractive optical elements (DOEs) are strictly related to the design wavelength due to the fact that they must introduce particular phase delay of the wavefront propagating through the structure. Mostly the attenuation of the material is not taken into account. In this article we propose to optimize thickness of the DOE by reducing introduced phase retardation but also attenuation. The efficiency of DOEs is determined by the method of coding phase distribution and can be easily measured by using diffraction orders of corresponding diffraction grating. Here, we analyze binary phase diffraction gratings with assumed attenuation.
For full paper see http://www.photonics.pl/PLP/index.php/letters/article/view/10-41
… The designed gratings were manufactured in a 3D printing technique in paper using an MCor Iris printer . Prior to the design process was the determination of the material optical properties. Time Domain Spectroscopy (TDS ‒ TeraView) was used for this task …
Monday, 22 April 2019
Utilizing multilayer structures to enhance terahertz characterization of thin films ranging from aqueous solutions to histology slides
SUN, QIUSHUO, KAI LIU, XUEQUAN CHEN, XUDONG LIU, AI HERNANDEZSERRANO, and E. M. M. A. PICKWELL-MACPHERSON. "Utilizing multilayer structures to enhance terahertz characterization of thin films ranging from aqueous solutions to histology slides." Optics Letters
We propose a multilayer geometry to characterize thin film samples in reflection terahertz time domain spectroscopy. Theory indicates that this geometry has higher sensitivity compared to ordinary transmission or reflection geometries when characterizing both low and high absorption samples. Pure water and water-ethanol mixtures are measured to verify the characterization accuracy of the proposed geometry and its capability to measure trace liquids. Paraffin-embedded oral cancer tissues are imaged to further show how the proposed geometry enhances the sensitivity for solid low-absorptive films.
For full paper see https://www.osapublishing.org/ol/upcoming_pdf.cfm?id=359791
Thursday, 18 April 2019
Balbekin, Nikolay S., Quentin Cassar, Olga A. Smolyanskaya, Maksim S. Kulya, Nikolay V. Petrov, Gaetan MacGrogan, Jean-Paul Guillet, Patrick Mounaix, and Valery V. Tuchin. "Terahertz pulse time-domain holography method for phase imaging of breast tissue." In Quantitative Phase Imaging V, vol. 10887, p. 108870G. International Society for Optics and Photonics, 2019.
Pulse holographic imaging along with time-domain spectroscopy scan and tomographic techniques are of great interest. Since the advantages of holography are the lack of focusing optics and high spatial resolution, and, comparing with tomography, less computation cost for numerical reconstruction, this technique is preferable for the analysis of thin histological samples. In this work we have created the experimental scheme that involves measurement of diffraction pattern of the collimated THz pulse field spatial distribution at some distance behind the object in the time-domain mode, thus allowing reconstruction of amplitude and phase distribution at the object plane by numerical backpropagation of the wavefront in the spectral domain. In our experiment, we used a breast biopsy sample containing cancer tissues, we also performed numerical simulations accounting for experimental conditions to confirm the conceptual applicability of the reconstruction method.
For full paper see https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10887/108870G/Terahertz-pulse-time-domain-holography-method-for-phase-imaging-of/10.1117/12.2508711.short?SSO=1
BREAST TISSUE PROBING 3.1 Material & Methods A commercially available TeraPulse4000 (TeraView Ltd, Cambridge, UK) configured in reflection geometry by the means of external added optics was used to probe freshly excised breast tissues …