Abstract
Refractive index sensing is attracting extensive interest in sensing fields using terahertz technology. For improving the performance of terahertz sensors, a sensing scheme based on high-density polyethylene sunflower-type circular photonic crystal structure is proposed. The designed sensor in this paper contains two symmetrical sample cells surrounding a cavity in a circular photonic crystal. The sensor characteristics depending on the structure parameters are numerically investigated. Finally, a sensitivity of 7828 nm RIU−1, Q-factor of 185.91 and figure of merit of 1.89 are realized. This work is expected to lay the foundation of realization of high-performance terahertz wave sensors and may find potential applications in biological and chemical sensing.
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