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.
General approach of terahertz achromatic quarter- wave plate composed of stacked quartz plates.Optics Continuum, 2(7):1597, July 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.