Resonant spectra via radiation directionality of optical modes is key to overcoming intrinsic dispersion locking by misaligned bilayer metagratings

https://www.eurekalert.org/news-releases/1090744

"introduced a degree of lateral displacement, preserving spatial inversion symmetry while breaking vertical mirror symmetry... thin spacer layer flatness/ precise lateral misalignment: iterative deposition, ~10 nm bilayer alignment, spacer material compatibility... flexible experimental platform for studying bilayer photonic systems... high reflectance only at single angle/ wavelength.. AR/VR displays, coherent thermal radiation, advanced semiconductor manufacturing, compact optical/ spectral imaging, optical computing"