Theoretical reflective performance of a sandwiched two-layer grating polarizer

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

“…Performance comparison of the proposed double-sided grating and other reported gratings is shown in table 4. Compared with single-sided gratings [9,26] and 2D grating [27], some performance has been improved to a certain extent, especially for efficiency. Most notably, the proposed double-sided structure grating supports dual-functional polarizing or non-polarizing output, which is a significant advantage over single-sided gratings.…”

“…Besides, the finite element method (FEM) [33] is used to verify the parameters. The diffraction efficiencies are over 99% for TE and TM polarizations in both the upper and lower parts of the grating, which are higher than those of the simple two-layer gratings [9,26]. Most importantly, it is the first time that a doublesided structure grating that enables efficient dual-functional outputs with polarization-dependent and polarization-independent properties has been proposed.…”

“…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. Therefore, the high-density gratings can be designed to achieve high efficiencies for transverse-electric (TE) polarization in the -1st order and transverse-magnetic (TM) polarization in the 0th order, which can work as polarizing beam splitters [11][12][13][14].…”