High-Sensitivity Sensor Based on Plasmon-Induced Transparency in Terahertz Borophene Metasurface.

In this paper, we designed a multi-layer borophene-based nanoribbons metasurface and achieved a dynamically tunable plasmon-induced transparency (PIT) effect. The numerical results indicate that the parallel multi-layer borophene nanoribbons (BNRs) support the PIT effect. This can be seen as a PIT effect caused by bright-bright mode excitation and coupling between upper and lower layer. The physical principles of the double-layer nanoribbons model can be theoretically demonstrated by using the two-particle model. Due to the heavier effective mass of borophene nanoribbons in the y-direction, when the placement direction of borophene nanoribbons is changed from the x-direction to the y-direction, the position of the PIT peak undergoes a significant red shift. By increasing the borophene carrier density in the model, the PIT window produces a blue shift. The PIT window can be tuned by changing the carrier concentration. Finally, the sensitivity and figure of merit (FOM) of the sensor are calculated, and the results are 55.3 THz/RIU and 86.58, respectively. The proposed structure has potential applications in the research and design of high-sensitivity sensors, optical switches, and optical storage. [ABSTRACT FROM AUTHOR]