One-sided composite cavity on an optical nanocapillary fiber

We report on a numerical study of a one-sided cavity on an optical nanocapillary fiber (NCF) using a composite cavity. The composite cavity is formed by combining an optical NCF and an asymmetric defect mode grating. We design the cavity to realize the maximum channeling efficiency of up to ∼80% into one-sided NCF-guided modes while operating from under- to critical- and over-coupling regimes. For the maximum channeling efficiency case, we find the best performance parameters, such as quality factor, finesse, and one-pass loss of the cavity. The present platform may open a novel, to the best of our knowledge, route for designing fiber-based deterministic single-photon sources in quantum technologies.