Author(s): Seokwoo Kim, Kyungtae Kim, Youngsun Jeon, Heechang Yun, Minseok Choi, Dohyun Kang, Chanbeom Jeon, Yejin Park, Geumseong Lee, and Junsuk Rho By merging the wavelength-independent geometry of reflection with the momentum control of a periodic lattice, a deep binary grating efficiently routes multiple distinct wavelengths into a single diffraction angle. [Phys. Rev. Lett. 137, 176903] Published Thu Oct 22, 2026