In this research, we inform about fabrication of special photonic crystal fibers (PCFs) for a lossy mode resonance realization, which were developed and fabricated in our facilities. The fibers were formed by a limited number of air channels in a silica matrix. In this case, PCF modes can leak from a fiber core and it is possible to obtain the resonance due to coupling between the modes of the PCF core and modes of a thin absorbing coating without deleting or polishing a silica cladding, or fiber tapering. The fibers give also a possibility of a single-mode operation of sensors based on these fibers. Examples of possible using the fibers for fiber optic sensors are discussed.
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