Complete Terahertz Polarization Control with Broadened Bandwidth via Dielectric Metasurfaces

Table 1 Comparison of the proposed design with other terahertz polarization converters

References	Design	Functionality			Efficiency (%)	Bandwidth (%)	Phase delay
References	Design	linear to CP	Linear to cross	Linear to elliptical	Efficiency (%)	Bandwidth (%)	Phase delay
[31]	Mono-layer metallic MSs	√	×	×	45	12	90°
[29]	Mono-layer metallic MSs	√	×	×	30	5	90°
[32]	Mono-layer metallic MSs	×	√	×	4–9	11	/
[9]	Bi-layer metallic MSs	√	×	×	30	33	90°
[33]	Bi-layer metallic MSs	√	×	×	50–80	12	90°
[34]	Multi-layer metallic MSs	√	×	×	70	53	90°
[10]	Multi-layer metallic MSs	×	√	×	50–80	111	/
[35]	Si elliptical holes	√	×	×	50	3	90°
[18]	Double-unit Si pillars	√	√	×	13	5	90°, 180°
This work	Elliptical Si pillars	√	√	√	44–72	8–16	90°–270°