OSA Open Access Publishing AgreementFatobene Ando, RonHartung, AlexanderJang, BumjoonSchmidt, Markus A.2020-01-032020-01-032019https://doi.org/10.34657/72https://oa.tib.eu/renate/handle/123456789/4801Precise knowledge of modal behavior is of essential importance for understanding light guidance, particularly in hollow-core fibers. Here we present a semi-analytical model that allows determination of bands formed in revolver-type anti-resonant hollow-core fibers. The approach is independent of the actual arrangement of the anti-resonant elements, does not enforce artificial lattice arrangements and allows determination of the effective indices of modes of preselected order. The simulations show two classes of modes: (i) low-order modes exhibiting effective indices with moderate slopes and (ii) a high number of high-order modes with very strong effective index dispersion, forming a quasi-continuum of modes. It is shown that the mode density scales with the square of the normalized frequency, being to some extent similar to the behavior of multimode fibers.enghttps://www.osapublishing.org/library/license_v1.cfm620modal behaviorlight guidancehollow-core fibersArticle