Work

Wide-waveband and wide-angle blazing meta-fringe grating with global structural and angular dispersion engineering

Year: 2026

Type: article

Abstract: Diffraction gratings are the core elements in fields such as dispersion control and spectral detection. Traditional gratings can achieve maximum constructive interference and maximum period diffraction simultaneously for a single wavelength with a certain angle of incidence to meet the Bragg or blazing condition. Here, we expand the applicability of the blazing condition and propose a theory and its design scheme for meta-fringe gratings with a wide blazing waveband and a wide range of blazing angle of incidence. Based on global 2-dimensional control with structural dispersion and angle dispersion engineering, we enable meta-fringe gratings to exhibit simultaneous blazing across all wavelengths within the visible band over a wide range of incident angles. The design achieves an average diffraction efficiency exceeding 90% for wavelengths from 450 nm to 650 nm within an incident angle range of ±15°. The design theory and its scheme allow meta-fringe gratings to move beyond the limitations of traditional Littrow or blazing configurations, enabling flexible use of angle of incidence while achieving high diffraction efficiency across a broadband. It enriches the theoretical framework for metasurface grating design and significantly expands the application of metasurface gratings.

Source: Optics Express

DOI: 10.1364/oe.581190