Fig. 1. (a) Optical micrograph of an AR-PCF cross section. (b) Orientation-averaged Purcell enhancement map as a function of emitter position inside the fiber, obtained by the FEM simulations.

Fig. 2. Numerically calculated field distribution of (a) core LP01 and (b) cladding modes. Microphotographs of the output fiber facet, revealing coupling to (c) core mode and (d) cladding modes. Discrepancies between numerical results and experimentally observed distributions occur owing to multiple cladding modes’ interference.

Fig. 3. (a) SEM image of the inner fiber capillary. (b) Zoomed view of the capillary sidewall. (c) CLSM cross section of the fiber section. (d) 3D reconstruction of the CLSM data plotted as iso-intensity surfaces.

Fig. 4. (a) Schematic of the experimental setup. Filtered supercontinuum light source is coupled to a fiber under test. (b) Positions of the collection points in experiment (1) core, (2) ring, and (3) cladding.

Fig. 5. (a) Normalized photoluminescence spectra of perovskite quantum dots inside the AR-PCF. (b) Lifetimes of quantum dots drop-cast on clean glass coverslip (reference) and measured from the core of AR-PCF (core). (c) Lifetimes of perovskite dots coupled to cladding and to the core of fiber. (d) Lifetimes of perovskite dots coupled to the capillary compared to the core of the fiber.