Free-base porphyrin is an attractive candidate as a sensory molecule due to its high fluorescence efficiency . In these studies, the self-assembled monolayer (SAM) method has been applied as the deposition technique of porphyrin molecules  (Fig. 1). To the best of our knowledge, this is the first paper reporting on the SAM deposition of porphyrins inside hollow-core photonic bandgap fiber (HCPBGF) and polarization maintaining fiber (PMF). HCPBGF (HC19-1550-01 from Blazephotonics) has 20 μm main hollow core and 4 μm small hollow cores. PMF (Fiber Optics Research Center, RAS) has two cores with 50 μm diameter and the central partition 10 μm.
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