Guided Mode Resonant Gratings for Broadband Reflection

ABSTRACT This review delves into guided mode resonance (GMR) gratings, highlighting their significance in broadband reflection due to their exceptional frequency selectivity and ability to manipulate electromagnetic fields. GMR gratings have evolved from single‐mode to multi‐mode applications, expanding their utility from narrowband to broadband reflections, with GMR reflectors emerging as a viable alternative to traditional Distributed Bragg Reflectors. Through optimal parameters of grating structure, GMR reflectors can perform a high and broadband reflectivity. Advances in nanofabrication and measurement technologies have facilitated the realization of GMR gratings, which are now poised to enhance high‐power lasers, optical couplers, photodetectors, and optical communication systems. The paper provides a comprehensive overview of the resonant principles, implementation structures, fabrication techniques, and applications of GMR broadband reflectors, concluding with a future outlook on their potential in photonics.