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Received: 9 January 2019 Accepted: 29 March 2019 In this paper, a viable design of mid-infrared refractive index sensor based on photonic crystal coupled cavity-two waveguides is proposed. An increasing number of works are dedicated to investigate the behavior of refractive index sensor based on photonic crystal in the mid-infrared range. We define the sensitivity of our sensor by detecting the shift in the resonance wavelength as a function of the refractive index’s variations in the region around the cavity. The purpose of this study is to design a highly sensitive mid-infrared photonic crystal sensor. Consequently, an improved sensitivity of 650 nm/RIU (refractive index units) with a detection limit of 0.001 RIU has been obtained. The sensitivity can be improved from 394 nm/RIU to 758 nm/RIU with a detection limit of 0.01 RIU in the wavelength range of 2,97 μm to 3,71 μm by increasing the number of the infiltrated holes. The same design has been used as a liquid sensor and a sensitivity of 550 nm/RIU has been achieved with a detection limit of 0.001 RIU for RI=1.33 and RI=1.331. The properties of the sensor are simulated using the finitedifference time-domain (FDTD) method from the RSoft software package.

Mid-infrared Refractive Index Sensor Based on a 2D Photonic Crystal Coupled Cavity-two Waveguides