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Non-Hermitian systems have recently attracted significant attention inphotonics. One of the hallmarks of these systems is the possibility ofrealizing asymmetric mode switching and omnipolarizer action through thedynamic encirclement of exceptional points (EP). Here, we offer a newperspective on the operating principle of these devices, and we theoreticallyand experimentally show that asymmetric mode switching and omni-polarizeraction can be easily realized with the same performance and limitations, usingsimple configurations that emulate the physics involved in encircling EPswithout the complexity of actual encirclement schemes. The proposed concept of'encirclement emulators' and our theoretical and experimental results may allowa better assessment of the limitations, practical potential, and applicationsof EP encirclements in non-Hermitian photonics.

Emulating exceptional-point encirclements using imperfect (leaky) photonic components