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We experimentally explored novel behaviors of non-reciprocal absorption andalmost zero reflection in a dual photon resonator system, which is physicallyseparated and composed of two inverted split ring resonators (ISRRs) withvarying inter-distances. We also found that anelectromagnetically-induced-transparency (EIT)-like peak at a specificinter-distance of d = 18 mm through traveling waves flowing along a sharedmicrostrip line to which the dual ISRRs are dissipatively coupled. With the aidof CST-simulations and analytical modeling, we found that destructive and/orconstructive interferences in traveling waves, indirectly coupled to each ISRR,result in a traveling-wave-induced transparency peak within a narrow window.Furthermore, we observed not only strong non-reciprocal responses ofreflectivity and absorptivity at individual inter-distances exactly at thecorresponding EIT-like peak positions, but also nearly zero reflection andalmost perfect absorption for a specific case of d = 20 mm. Finally, theunidirectional absorptions with zero reflection at d = 20 mm are found to beascribed to a non-Hermitian origin. This work not only provides a betterunderstanding of traveling-wave-induced indirect coupling between two photonicresonators without magnetic coupling, but also suggests potential implicationsfor the resulting non-reciprocal behaviors of absorption and reflection inmicrowave circuits and quantum information devices.

Non-reciprocal absorption and zero reflection in physically separated dual photonic resonators by traveling-wave-induced indirect coupling