Optics and Photonics Society of Iran

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In this paper, by changing the geometry and design of the unit cell of the sensor structure without changing the values ​​of the parameters, the sensitivity of the metamaterial sensor based on the refractive index introduced in the infrared region is increased. Metamaterial-based infrared sensors have attracted a lot of attention due to their ease of fabrication and various applications. By studying the performance of metamaterial sensors, it is shown that the sensitivity of sensors can be greatly increased using metamaterials. In the sensor design, a metamaterial structure with unit cells consisting of two layers of silver is used so that the first layer consists of two metal nano-rods and two nano-plates while the second layer includes a uniform silver plate such that the structure acts as a perfect resonant absorber. Moreover, its resonance frequency strongly depends on the refractive index of the environment, and the results show that by changing the geometry of the structure, a higher sensitivity can be achieved. The initial sensitivity of the sensor structure was 2720 nm / RIU while by changing the geometry and eliminating some layers, the final sensitivity can be increased to 4077.2 nm/RIU. 

Keywords: Sensor, Metamaterials, Sensitivity, Infrared

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