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Fabrication procedure and refractive index (RI) sensitivity of a diamond-like carbon (DLC) nano-coated optical fiber sensing structure is presented. The overlays were deposited by Radio Frequency Plasma Assisted Chemical Vapor Deposition (RF PACVD) method on both cores of a polymer-clad silica (PCS) multimode optical fibers and oxidized silicon wafers. It is shown that thin (120 to 330nm in thickness measured on the silicon wafers) and high refractive index (∼2.14 at λ=620nm) overlays can effectively modify optical response of the structures to variation of the external RI. By deposition of the overlay we achieved 5-times increase in the RI sensitivity of the investigated samples

Refractive Index Sensitivity of a Polymer-Clad Silica Optical Fiber Structure Effectively Tuned by Plasma Deposited Diamond-Like Carbon Nano-Coating