Regarding PML in photonic crystal fiber?

09 October 2020 0 7K Report

in PCF PML is taken around over cladding outer surface. is there any free space or vacuum between cladding outer boundary and PML starting layer?

the main work of PML is to absorb the reflected light, can this work be done just by filling the first ring of air holes with some external material, which has some absorption coefficient?

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