Transparent polymeric metagratings for augmented-reality glasses
Fully polymeric, encapsulated metagratings made by nanoimprint lithography reflect red, green and blue light while staying transparent: a scalable route to AR optical combiners.
Two colours of light from one infrared beam: a graphene–lithium niobate metasurface
A hybrid graphene–LiNbO3 metasurface generates second and third harmonics simultaneously, boosted by guided-mode resonances that are tuned by geometry.