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A fundamental requirement for photonic technologies is the ability to controlthe confinement and propagation of light. Widely utilized platforms includetwo-dimensional (2D) optical microcavities in which electromagnetic waves areconfined between either metallic or distributed Bragg reflectors. Recently,transition metal dichalcogenides hosting tightly bound excitons with highoptical quality have emerged as promising atomically thin mirrors. In thiswork, we propose and experimentally demonstrate a sub-wavelength 2D nano-cavityusing two atomically thin mirrors with degenerate resonances. Angle-resolvedmeasurements show a flat band, which sets this system apart from conventionalphotonic cavities. Remarkably, we demonstrate how the excitonic nature of themirrors enables the formation of chiral and tunable optical modes upon theapplication of an external magnetic field. Moreover, we show the electricaltunability of the confined mode. Our work demonstrates a mechanism forconfining light with high-quality excitonic materials, opening perspectives forspin-photon interfaces, and chiral cavity electrodynamics.

Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors