We report on experimental evidence of unidirectional transmission of terahertz waves through a pair of metallic gratings with different periods. The gratings are optimized for a broadband transmission in one direction, accompanied with a high extinction rate in the opposite direction. In contrast to previous studies, we show that the zero-order nonreciprocity cannot be achieved. Nonetheless, we confirm that the structure can be used successfully as an asymmetric filter.
© 2013 Optical Society of America
Diffraction and Gratings
Original Manuscript: December 12, 2012
Manuscript Accepted: January 14, 2013
Published: March 11, 2013
Marcin Stolarek, Dmitriy Yavorskiy, Rafał Kotyński, Carlos J. Zapata Rodríguez, Jerzy Łusakowski, and Tomasz Szoplik, "Asymmetric transmission of terahertz radiation through a double grating," Opt. Lett. 38, 839-841 (2013)