Jolly A.,ALPhANOV |
Jolly A.,Cea Center Detudes Scientifiques Et Techniques Daquitaine |
Chassagne B.,ALPhANOV |
Jolly J.-C.,University of Notre Dame
Optics Communications | Year: 2013
An original design of generic interest is proposed for fast imaging, in the field of sub-terahertz frequencies, by means of resonant coupling between an ultra-thin photo-thermal converter and a metallic grid upstream an infrared camera. The material is a sheet of polyimide material with a high content of absorptive carbon inclusions. We make use of the large difference between the IR and THz wavelengths in a quarter-wave planar geometry, to ensure a highly efficient and stable conversion process. A complete setup has been implemented for demonstration purposes, using the beam from a Gunn diode at 110 GHz. Experimental results are in good agreement with the predictions from the numerical model, which helps to validate the concept and the requirements for geometrical adjustment. © 2013 Published by Elsevier B.V.