Journal of East China Normal University(Natural Science) ›› 2023, Vol. 2023 ›› Issue (4): 94-100.doi: 10.3969/j.issn.1000-5641.2023.04.010

• Physics and Electronics • Previous Articles     Next Articles

Analysis of negative transmission in metagratings with different complex unit cells

Haiqin GUO, Junjie DU*()   

  1. School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
  • Received:2022-04-06 Online:2023-07-25 Published:2023-07-25
  • Contact: Junjie DU


Based on multiple scattering theory, the effect of the configuration of complex unit cells on transmissivity in the negative first diffraction order is studied when negative transmission occurs in metagratings with a complex unit cell; that is, when transmitted beams lie on the same side of the normal as incident beams occurs in such metagratings. The complex unit cells are composed of two dielectric nanorods of different radii that constitute a metagrating when they are arranged in a line. Our calculations show that no stringent requirements on the radius of the smaller rods and their position in a complex unit cell are required in order for the negative transmission to be perfectly efficient. This implies that the configuration of complex unit cells is robust to the negative transmission, and hence, that it is easier to construct a high-efficiency dielectric metagrating with a complex unit cell.

Key words: metagrating, negative transmission, complex unit cell, robustness

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