Abstract-Kapton-derived carbon as efficient terahertz absorbers

• S. Venkatachalam, 
• D. Bertin, 
• G. Ducournau, 
• J.F. Lampin, 
• D. Hourlier^, 

• IEMN, UMR-8520, Avenue Poincaré, BP 69, 59652 Villeneuve d'Ascq, France

Received 18 November 2015, Revised 30 December 2015, Accepted 2 January 2016, Available online 5 January 2016

http://www.sciencedirect.com/science/article/pii/S0008622316300033

The focus of this study is the preparation of carbon-based materials that satisfy the requirements of developing quasi-optic controllable absorbers for terahertz technology. These materials have been obtained from a commercially available organic polymer, Kapton® HN polyimide, through a pyrolysis process conducted in an inert atmosphere at different temperatures. The pyrolysis of Kapton film up to 1200 °C left a black residue principally composed of graphitic-carbon with a yield of about 55%. The D.C. conductivity of materials measured at 295K increases with increasing pyrolysis temperature. The starting organic polymer is turned from an insulator to conductor material when heat-treated at over 700 °C. Moreover, in the frequency range 220-500 GHz, the pyrolyzed materials show distinct optical properties, which have variant degrees of terahertz absorption. Kapton® HN polyimide that is thermally converted into carbon-based materials may be used for the realization of calibrated terahertz absorbers, particularly for thermal transducers.

Corresponding author. Tel.: +33 320197836

Copyright © 2016 Published by Elsevier Ltd.

Abstract-Ultrawide-Bandwidth Single-Channel 0.4-THz Wireless Link Combining Broadband Quasi-Optic Photomixer and Coherent Detection

Ducournau, G. 
Institut d'Electronique, Micro électronique et de Nanotechnologies (IEMN), UMR CNRS 8520/Universit?? de Lille 1, Villeneuve d'Ascq cedex, France 
Szriftgiser, P. ; Beck, A. ; Bacquet, D. ; Pavanello, F. ; Peytavit, E. ; Zaknoune, M. ; Akalin, T. ;Lampin, J.-F.

http://ieeexplore.ieee.org/xpl/abstractAuthors.jsp?reload=true&arnumber=6774486&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A5741778%29

Free space communications with huge data capacity have become a key point for the development of mobile access, services, and network technologies convergence. Wireless links using emerging terahertz technologies, also referred to as T-ray communications, have become an intensive research field within last years since T-rays at the millimeter/submillimeter frontier remain more robust in terms of scintillation, dielectric obstacles, and fog compared with near-infrared signals. Using a passive THz hot-spot which can be fed by fiber optic networks, we investigate up bit rates up to 46 Gbps for a THz wireless transmission system at 400-GHz carrier frequency. Using a THz photomixer integrated with a specific broadband antenna and heterodyne electronic detection, we investigate the eye diagrams using 1-$mu$ W received power, highlighting the high sensitivity and ultra-wideband behavior of the whole THz system.

Published in:

Terahertz Science and Technology, IEEE Transactions on  (Volume:PP ,  Issue: 99 )