Abstract
An integrated dual-channel sensing method utilizing polarized dissimilation is investigated with an appropriately designed plasmonic metasurface. By assembling two different kinds of nano-gold antennas to constitute a periodic array, the phase of diffraction fields contains both spin-dependent geometric phase and resonance-dependent dynamic phase components. Accurate control over the superposition of orthogonal spin components utilizing strong photonic spin-orbit interaction of metasurface leads to dissimilar response of different diffraction orders. The simulation shows that the linear polarization of diffraction orders rotate in the reverse direction () with the refractive index variation (1.3–1.5). The sensing method exhibits an extremely high signal-to-noise ratio and stability.
© 2019 Optical Society of America
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