Abstract
In this paper, a polarization-insensitive sensor based on graphene electromagnetically induced transparency (EIT) is proposed. The device consists of two graphene orthogonal T-shaped structures. This T-shaped resonator produces transparent windows that largely overlap under x and y polarizations, and the results demonstrate its good polarization insensitivity. The device can accomplish detection performance with sensitivity higher than 4960nm/RIU and figure of merit (FOM) greater than 11.4. Meanwhile, when the Fermi energy level of graphene changes from 0.5to 0.8eV, it enables arbitrary modulation of the operating frequency over a wide frequency range of about 4.5terahertz in the mid-infrared band. Our work has the potential to significantly advance the area of biological molecular detection.
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