Terahertz Fabry-Perot Interferometer Constructed by Metallic Meshes with Micrometer Period and High Ratio of Linewidth/Period

Abstract:

The possibility of constructing terahertz Fabry-Perot interferometer using metallic meshes with micrometer period and high ratio of linewidth/period is investigated, and the effectivity of traditional equivalent circuit method is verified by FDTD method. Simulation shows that the reflectance and transmittance of this kind of meshes calculated by equivalent circuit method have considerable deviation from those obtained by vector analysis of FDTD, so equivalent circuit method can be used to roughly evaluate the properties of this kind of metallic meshes. By using a metallic mesh with the period of 5 micrometers and the ratio of linewidth/period of 0.8, a finesse larger than 1100 can be achieved while the peak transmittance is still larger than 0.2 for a Fabry-Perot interferometer. It is therefore concluded that a high-quality terahertz Fabry-Perot interferometer can be constructed by using metallic meshes with micrometer period and high ratio of linewidth/period.

• Periodical: Key Engineering Materials (Volume 437)
• Pages: 286-290
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.437.286
• Online since: May 2010
• Authors: Zhen Gang Lu, Jiu Bin Tan, Zhi Gang Fan
• Keywords: Fabry-Perot Interferometer, FDTD, Metallic Mesh, Terahertz

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