Experimental Analysis of Thin Graphite Periodic Structures in the THz Band
The THz gap has attracted considerable interest in the last decade in a wide range of applications (from astronomy to biology) due to the low energy of the THz waves and their capability to provide chemical recognition and non-destructive inspection. To implement THz-based solutions, a wide range of components have been developed and efforts are being done to reduce the system cost through the use of cost effective materials. This presentation analyzes the development of metal wire grids by using the conductive properties of graphite. The aim is drawing the wire grid using a simple graphite lead pencil on standard paper. This would reduce the cost of several wire grid base components, such as polarizers or filters. An 8B pencil is used because of its high graphite contents. Parameters such as the pitch of the structure and its fill factor are set to study the behavior of the metal grid in a frequency range from 0.1 to 0.7 THz. An average pitch of 800 micrometers with a fill factor of 0.8 corresponds to an ER of 2dB. The samples are analyzed using a fiber-based pulsed THz Time Domain Spectrometer in transmission mode. An ultrafast laser pulse impinges on a photoconductive antenna generating the THz beam that is detected by a similar switch. Preliminary experimental results show that the increase of the angle between the horizontally-polarized incoming electric field and the graphite periodic structure corresponds to a decrease of the THz absorption, hinting at a polarizer behavior.
M.P.M.Colleoni B.Vidal
Nanophotonics Technology Center, Universitat Politècnica de València 8F Building, Camino de Vera, sn, Valencia 46022, Spain
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
963-965
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）