Higher-order effective medium theory shows that single-mode operation and Fabry-Perot resonances impose an intrinsic bandwidth ceiling on rectangular dielectric grating quarter-wave plates in the terahertz range.
Wideband sub-THz half-wave plate using 3D-printed low-index metagratings with superwavelength lattice.Optics Express, 27(1):202, January 2019
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Fundamental Limitations of Terahertz Quarter-Wave Plates Based on High-Contrast Dielectric Gratings
Higher-order effective medium theory shows that single-mode operation and Fabry-Perot resonances impose an intrinsic bandwidth ceiling on rectangular dielectric grating quarter-wave plates in the terahertz range.