Optical anti-counterfeiting component and optical anti-counterfeiting product
The present invention discloses an optical anti-counterfeiting component and an optical anti-counterfeiting product. The optical anti-counterfeiting component comprises: a substrate; a sub-wavelength surface micro-structure and an optical reflection facet formed on an upper surface of the substrate; and a multi-layer structured coating formed on the sub-wavelength surface micro-structure and the optical reflection facet. In the case where the same multi-layer structured coating is used, a contrasting optical characteristic is formed between the region in which the sub-wavelength surface micro-structure and the multi-layer structured coating lie and the region in which the optical reflection facet and the multi-layer structured coating lie, so that the optical anti-counterfeiting component or the optical anti-counterfeiting product that includes the optical anti-counterfeiting component can be identified easily and has high anti-counterfeiting capability.
1. An optical anti-counterfeiting component, comprising:
a substrate;
a sub-wavelength surface micro structure and an optical reflection facet, wherein at least part of an upper surface of the substrate is covered by the sub-wavelength surface micro-structure and the optical reflection facet; and
a multi-layer structured coating formed on the sub-wavelength surface micro-structure and the optical reflection facet, wherein, the multi-layer structured coating forms a Fabry-Perot resonant cavity or a hollowed-out pattern.
2. The optical anti-counterfeiting component according to claim 1 , wherein, the sub-wavelength surface micro-structure and the optical reflection facet overlap with each other partially.
3. The optical anti-counterfeiting component according to claim 1 , wherein, the sub-wavelength surface micro-structure is an one-dimensional grating or a two-dimensional grating; a groove shape of the sub-wavelength surface micro-structure is sinusoidal, rectangular, or zigzag shape, or a shape joined or combined from at least two of sinusoidal, rectangular, and zigzag shapes.
4. The optical anti-counterfeiting component according to claim 3 , wherein, a groove depth of the sub-wavelength surface micro-structure is 10 nm-500 nm.
5. The optical anti-counterfeiting component according to claim 4 , wherein, the groove depth of the sub-wavelength surface micro-structure is 50 nm-300 nm.
6. The optical anti-counterfeiting component according to claim 1 , wherein, a characteristic dimension of the sub-wavelength surface micro-structure in a two-dimensional plane in which the sub-wavelength surface micro-structure lies is 50 nm-500 nm.
7. The optical anti-counterfeiting component according to claim 6 , wherein, the characteristic dimension of the sub-wavelength surface micro-structure in a two-dimensional plane in which the sub-wavelength surface micro-structure lies is 200 nm-400 nm.
8. The optical anti-counterfeiting component according to claim 1 , wherein, a characteristic dimension of the optical reflection facet in at least one dimension of a two-dimensional plane in which the optical reflection facet lies is 1 μm-300 μm.
9. The optical anti-counterfeiting component according to claim 8 , wherein, the characteristic dimension of the optical reflection facet in at least one dimension of a two-dimensional plane in which the optical reflection facet lies is 3 μm-100 μm.
10. The optical anti-counterfeiting component according to claim 9 , wherein, the characteristic dimension of the optical reflection facet in at least one dimension in a two-dimensional plane in which the optical reflection facet lies is 5 μm-30 μm.
11. The optical anti-counterfeiting component according to claim 1 , wherein, at least one of diffraction optical variable feature, micro-nano structural feature, printing feature, fluorescent feature, and magnetic, optical, electrical, or radioactive feature for machine reading is formed on at least one of the substrate, the sub-wavelength surface micro-structure, and the optical reflection facet.
12. The optical anti-counterfeiting component according to claim 11 , wherein, the hollowed-out pattern has a registration relationship with the sub-wavelength surface micro-structure and/or the optical reflection facet.
13. The optical anti-counterfeiting component according to claim 1 , wherein, the multi-layer structured coating consists of at least two of an absorbing layer, a dielectric layer, and a reflecting layer, or the multi-layer structured coating consists of dielectric layers.
14. An optical anti-counterfeiting product, comprising the optical anti-counterfeiting component of claim 1 .