Band gap characteristics of multi-functional lattice metamaterials with adjustable thermal expansion and Poisson's ratio

Abstract

The current development of science and technology has put increased demands on the versatility of metamaterials. In this paper, the band gap characteristics of a lattice metamaterial that can simultaneously modulate thermal expansion and Poisson's ratio are studied, the dispersion characteristics of elastic waves propagating in periodic lattice metamaterials are analyzed, and the effects of different structures and parameters on the band gap are discussed. The results indicate that the configuration has excellent band gap properties while satisfying the tunable coefficient thermal expansion (CTE)and Poisson's ratio functions. Through reasonable material selection and shape design, it is expected to achieve a multi-objective win-win for specific thermal expansion properties, Poisson's ratio, and band gap design, resulting in better tunability and versatility of the metamaterial.

Double-sided structure grating for dual-functional polarizing or non-polarizing splitter

“…With the development of micro-nano processing technology, metamaterials [1,2] and micro-nano gratings [3][4][5][6] are rapidly developing and attracting more and more attention. High-density gratings [7][8][9][10] whose periods are close to the incident wavelength can limit the diffraction orders to the -1st order and the 0th order, and the diffraction efficiencies in the -1st order and 0th order can be adjusted by adjusting the accumulated phase difference of mode 1 and mode 0 excited by the incident light propagation in the grating region.…”