Fig. 1. (a) Image of preform prepared by stack method; (b) SEM image of preform

Fig. 2. Cross-section images of air suspended core fiber. (a)(b) Optical microscopy images; (c)(d) SEM images

Fig. 3. Propagation loss of air suspended core fiber at the wavelength of 532 nm

Fig. 4. Schematic of experimental setup

Fig. 5. Longitudinal section of air suspended core fiber (a) unfilled and (b) filled with quantum dots suspension

Fig. 6. Fluorescence spectrum of quantum dots measured by a microplate reader

Fig. 7. (a) Raw and (b) normalized fluorescence spectra of quantum dots in suspension with different concentrations measured by air suspended core fiber

Fig. 8. Linear relation between the concentration and (a) fluorescence peak intensity and (b) 600-800 nm area integral intensity of quantum dots measured by air suspended core fiber

Fig. 9. Photo-bleaching curves of Rhodamine B

Fig. 10. (a) Measured fluorescence spectra of quantum dots using different lengths of fiber; (b) fitting curve of fluorescence intensity and fiber length