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.
Extend the Bandwidth of Terahertz Polarization Convertors Further via All-Dielectric Grating Structures.Journal of Lightwave Technology, 42(23):8336–8342, December 2024
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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.