全像光學元件反光紙是一種光柵的應用，利用壓印技術來製作。將此反光片貼在汽車的後面，可以反射後方來車照射的燈光。經過計算後的光柵反光紙，白光入射時會反射特定的色光，此種反光紙不需要能量來驅動、且方便製作，可成為一種路況警告標誌。如果將貼紙貼在彎曲的車道上，架駛人可以由反光紙的顏色來判斷車子在路上的位置，這種反光紙是個非常好的路況指標，尤其是在窄路或彎曲的公路上。
Hoe reflector can be a road sign and an automobile reflector. It is made by injection techniques. The reflector, stuck on the backside of a car, will reflect the ray from the backside car lamp. After calculating the grating fringes, white incident light will be reflected as a specific ray color according to the distance of two cars. The reflector strip has no power consumption and is easy to manufacture. It can be a distance warning device as a road sign. If we stuck the reflector strip on the road side wall, observer could measure the distance between car and road mark from its reflected colors. The reflector could be a road guide line, especially on the narrow or curvature road.
