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(a) Optical micrograph of the cross section of the SHMOF; (b) Schematic diagram of the liquid-core MOF with different colors indicating different RIs; (c) and (d) are optical microscope images of the actual optical field at the end facet of the air-core MOF and the dye-filled LC-MOF, respectively; ((e)–(i)) and ((j)–(n)) are calculated field distributions of several typical modes supported by the air-core and dye-filled liquid-core MOFs, respectively; (o) and (p) show the calculated effective RIs against wavelength for the five lowest-order core modes supported by the air-core SHMOF and the dye-solution-filled LC-MOF, respectively.
Configuration of the fiber-based fluorescence sensing system; inset: the enlarged liquid column in the fiber core.
(a) and (b) show the images of the fiber longitudinal profile and the emission light collected with and without the added LP filter, respectively; (c) Fluorescence intensity emitted from the dye in the fiber center hole that corresponded to the position in Fig. 3(b) with a dye concentration of 5 × 10−12 M; (d) and (e) show the fluorescence intensity changes with the R6G dye concentrations.
(a) Image of the fiber longitudinal profile with two sections filled with R6G solutions; (b) Fluorescence image of the fiber at the same position as in (a) but with an added filter; (c) Calculated normalized fluorescence intensity along the fiber corresponding to the position in (b).
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