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Abstract
All-dielectric metasurfaces have been widely used in nanophotonics because of their properties, such as negligible Ohmic loss, stable properties, and flexible fabrication techniques. We propose an all-dielectric metasurface consisting of subwavelength particles, which supports a “trapped” mode after the introduction of adequate symmetry-breaking in the silicon meta-atoms. Coating the metasurface with monolayer graphene enables the adsorption of nucleic acids such as DNA and RNA. We compare the resonant states in the transmission spectrum and find that the proposed metasurface is ultra-sensitive to the surrounding environment and exhibits excellent biosensing performance. Our conclusions indicate that all-dielectric metasurfaces can be a promising platform to realize ultra-sensitive bio-sensors.
Highlights
Metasurfaces are artificial two-dimensional materials and have attracted significant interest because of their unique electromagnetic properties, which surpass natural material properties
We propose an all-dielectric metasurface consisting of subwavelength particles, which supports a “trapped” mode after the introduction of adequate symmetry-breaking in the silicon meta-atoms
We propose an all-dielectric metasurface consisting of subwavelength particles, which supports the “trapped” mode after introducing adequate symmetry-breaking in silicon metaatoms
Summary
Metasurfaces are artificial two-dimensional materials and have attracted significant interest because of their unique electromagnetic properties, which surpass natural material properties. They are 2D counterparts of metamaterials and are capable of manipulation of light propagation. Metasurfaces consisting of metal have been widely explored because of their ability to confine light, which results in strong light-matter interaction. This intense light concentration can be utilized for the development of refraction index sensing [1].
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