Abstract
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 language | English |
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| IPC | G02B1/00; G02B5/00; G02B5/18 |
| Patent number | WO2014194920 |
| Filing date | 11/12/2014 |
| Country/Territory | International Bureau of the World Intellectual Property Organization (WIPO) |
| Priority date | 04/06/2013 |
| Priority number | EP20130170492 |
| Publication status | Published - 2014 |