Abstract
We theoretically report that asymmetric transmission phenomenon of linearly polarized light enables an ultrasensitive and background-free metamaterial sensor with a sensitivity of 47.5 THz/RIU in the optical range. The asymmetric transmission in the metamaterial arises from the twist arrangement of two cascaded ring apertures and its asymmetric factor can reach 0.47. Importantly, by detecting the direction-dependent polarization conversion, the metamaterial is capable of sensing refractive index of surrounding medium. The sensing principle dictated by cross-polarization makes the sensor background-free since co-polarization background noise is easily removed. The proposed metamaterial may open up opportunities to develop novel sensors and polarization modulators in the optical regime.
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