Abstract-Terahertz beam steering using active diffraction grating fabricated by 3D printing

Johannes M. Seifert, Goretti G. Hernandez-Cardoso, Martin Koch, and Enrique Castro-Camus

a) Photograph of the free-standing grating as printed. (b) Photograph of the grating in its pressing mount, a close-up image of three periods of the grating with a reference scale on the right-hand-size (1 mm per line) is provided. (c) Schematic of geometry of the THz optical path, the receiver and its corresponding lens are mounted on a motorized goniometer in order to vary the detection angle.

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-15-21737

In this article, we propose variable-period diffraction gratings for terahertz frequencies. The design, fabrication and characterization of such devices are presented. Our measurements show the possibility to actively shift of the deflection angle for each frequency using this device. We also demonstrated that, when driven by a speaker, these variable gratings can be used for active beam steering with potential application in terahertz communications.

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