A method of fabricating a color filter is provided. Embedded in the message is data, such as a code, that indicates the size of the digital fingerprint. Therefore, the composition may be widely used as a pharmaceutical or cosmetic anti-aging composition. Furthermore, the present invention allows a user to adjust or position the IO devices in a variety of positions to accommodate the user. The plurality of openings are arranged periodically in a first direction in the metal film, and both a size of each of the plurality of openings and an interval thereof in the first direction are equal to or less than the wavelength of the light.