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.
Ultrawide tunable terahertz phase shifter based on a double-layer liquid crystal–dielectric grating.Journal of the Optical Society of America B, 40(10):2650, October 2023
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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.