Asymmetric transmission of terahertz radiation through a double grating

Stolarek M., Yavorskiy D., Kotyński R., Zapata Rodríguez C., Łusakowski J., and Szoplik T.

Optics Letters

38 (6), 2013, 839-841, 10.1364/OL.38.000839

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.