NEAR-FIELD TERAHERTZ PROBES BASED ON POINTED METAL GUARDS WITH DIFFRACTION GRATINGS С ДИФРАКЦИОННЫМИ РЕШЕТКАМИ

M. . Tinskaya, A. . Denisyuk


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Abstract

 We propose new design of a near-field terahertz probes based on pointed metal guards with diffraction gratings. Diffraction grating application allows enhancing efficiency of a near-field probe. The effect is based on the constructive interference of the wave diffracted on the grating and the wave directed to the tip of the probe. Design parameters analytical calculations of the terahertz probe with a diffraction grating and numerical modeling of electrodynamics by finite difference method are presented in the paper. The possibility of such probes fabrication based on electrochemical etching is experimentally considered. 


Keywords: near-field terahertz microscopy, near-field terahertz probes, surface electromagnetic waves. 
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