Interestingly, with the increase in the refractive index n , the sensitivity and FOM of the three Quasi BICs all illustrated an increasing trend, which verified that the interaction between the medium around the metasurface and the electric field is enhanced with the increase in the refractive index n .
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Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum.
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