Showing posts with label B. Vidal. Show all posts
Showing posts with label B. Vidal. Show all posts

Saturday, December 28, 2019

Abstract-Terahertz Spectroscopy of Engineered Stone


M. A. Báez-Chorro, B. Vidal, 


In this work several brands of engineered stone composites have been studied in the terahertz band. The dielectric properties of the samples were determined using THz Time Domain Spectroscopy. Imaging of the internal stone patterns was performed as well. Results show different absorptions and refractive indexes for each brand which can be related to the different compounding processes employed. This study realizes the capability of terahertz radiation as a viable way of inspection of stone composites.

Sunday, November 30, 2014

Abstract-Analysis of the THz response of a simple periodic graphite-based structure



Analysis of the THz response of a simple periodic graphite-based structure

M.P.M. Colleoni and B. Vidal  »View Author Affiliations

Optics Express, Vol. 22, Issue 24, pp. 30156-30160 (2014)
http://dx.doi.org/10.1364/OE.22.030156

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We report the observation of the dichroism effect in simple wire grid structures made of graphite on a paper substrate, i.e. we investigate the feasibility of drawing polarizers for the THz band using conventional graphite-based lead pencils. The displacement of the maximum frequency of the selective absorption phenomenon by varying the wire pitch hints at a polarizing behavior. Measurements of the maximum and minimum of transmission efficiency, extinction ratio and degree of polarization are carried out with a transmission fiber THz-TDS setup. Experimental results show a 9 dB extinction ratio for an inexpensive (<1$) home-made component.
© 2014 Optical Society of America