Resonant photo-thermal conversion for sub-terahertz imaging
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- 作者：Alain Jolly ; Bruno Chassagne ; Jean-Claude Jolly
- 关键词：Terahertz imaging ; Photo-thermal conversion ; Quarter-wave resonance
- 刊名：Optics Communications
- 出版年：15 January, 2013
- 年：2013
- 卷：311
- 期：Complete
- 页码：325-331
- 全文大小：1599 K
文摘
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.