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Simple structure, quick response, and highly sensitive miniaturized sensors are highly desirable for the broad range of sensing applications. In this work, we numerically investigated a highly sensitive photonic-crystal-fiber (PCF)-based plasmonic sensor for refractive index sensing. We consider gold as the plasmonic material, which is used outside the fiber structure to exhibit the plasmonic phenomena and to help detect the surrounding medium refractive index. The proposed PCF is designed to enable the evanescent field to interact with an external sensing medium leading to a highly sensitive response. The sensor performance has been investigated by wavelength and amplitude interrogation methods. The proposed sensor exhibits the maximum amplitude sensitivity of 2,843  RIU^−1 with the sensor resolution of 3.5×10^−6  RIU, which is the highest among the reported PCF SPR sensors, to the best of our …