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The present invention relates to an optical device having a nano-structured surface capable of providing a structural color to a normal human viewer, the device made being manufactured in one single material. A plurality of nano- structured protrusions (5) is further arranged with a first periodicity (P1) in a first direction and a second periodicity (P2) in a second direction, the first and second periodicity being chosen so that the optical reflection is dominated by specular reflection. The nano-structured protrusions are optionally arranged with a relative spatial randomness (SR) with respect to the average surface positions. The position, size, and randomness of the protrusions are arranged so as to provide, at least up to a maximum angle of incidence (A_in) with respect to a normal to the surface, an angle-independent substantially homogeneous structural color perception for a normal human viewer, at least up to a maximum observation angle (A_obs) with respect to a normal to the surface.
Original languageEnglish
IPCG02B1/00; G02B5/00; G02B5/18
Patent numberWO2014194920
Filing date11/12/2014
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date04/06/2013
Priority numberEP20130170492
Publication statusPublished - 2014

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