An all-dielectric metasurface sensor for exciting ring dipole Fano resonance

Abstract

The invention belongs to the technical field of metamaterials, and discloses an all-dielectric metasurface sensor that excites ring dipole Fano resonance. The all-dielectric metasurface structure array includes several all-dielectric metasurface unit structures, which are periodically arranged on the base Above; the all-dielectric metasurface unit structure includes three rectangular blocks; the first angle is formed between the long side of the first rectangular block and the negative direction of the X axis, and the second rectangular block and the third rectangular block are respectively arranged on the first rectangular block On both sides of , the long side of the second rectangular block and the long side of the third rectangular block are respectively perpendicular to the long side of the first rectangular block, and the center point of the second rectangular block and the third rectangular block is in the 180° rotational symmetry; the distances between the central long axes of the second rectangular block and the third rectangular block and the perpendicular bisector of the central long axis of the first rectangular block are equal. The invention can excite high-Q Fano resonance in the near-infrared band, and realize high-quality factor all-dielectric metasurface refractive index sensing.

Description

technical field [0001] The invention belongs to the technical field of metamaterials, and more specifically relates to an all-dielectric metasurface sensor that excites ring dipole Fano resonance. Background technique [0002] At present, optical resonators with high quality factor (Q) have potential wide applications in high-performance sensing, fast-response switching, single-photon emission, etc., and have become one of the important research directions in the field of micro-nanophotonic devices. Among them, Fano resonance reduces the radiation loss in the far field through the coupling of two different resonance modes, which is a common method to improve the Q value of resonance. In recent years, due to the simple design and excellent performance of metamaterials / metasurfaces, more and more researchers are committed to using metamaterials / metasurfaces to realize high-Q Fano resonances. [0003] However, the Q value of Fano resonance is often affected by ohmic loss and r...

AI Technical Summary

Problems solved by technology

[0003] However, the Q value of the Fano resonance is often affected by ohmic losses and radiation losses

At present, most of the researches on the use of metasurface structure to generate ring even resonance are concentrated in the terahertz band, and the complex metal structure is used, which has a large radiation loss, and the Q value of the Fano resonance excited by it is low.

Images