Fig. 1. Unidirectional waveguide diagram

Fig. 2. Electromagnetic mode in waveguide

Fig. 3. Ag ND-WS₂ heterostructure plexcitonic system

Fig. 4. Mach-Zehnder interferometer isolator concept

Fig. 5. Schematic optical non-reciprocity principle and experimental setup for room temperature all-optical isolation

Fig. 6. Loss-induced nonreciprocity

Fig. 7. Design and control of the quasi-BIC modes

Fig. 8. Schematic of an all-optical nonreciprocal systemconsisting of two microring resonators（R_A and R_B）and two nearby optical waveguides (WG1 and WG2)

Fig. 9. Device design of ultra-fast ultra-low energy all-optical switching in lithium niobate nanophotonics