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1. (WO2018142339) MULTILAYER OPTICAL ELEMENT FOR CONTROLLING LIGHT
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WHAT IS CLAIMED IS:

1. A multilayer optical element, comprising a plurality of layers arranged along an optical axis, each layer having a plurality of nanostructures, wherein a size of- and a spacing between- said nanostructures is selected to provide a resonant response to an optical field at a different wavelength, and wherein a distance between said layers is selected to induce destructive or instructive interference of optical field components within a spectral crosstalk among said resonant responses.

2. The optical element according to claim 1, wherein for each layer, a standard deviation of a size of said nanostructures is less than 20% of an average size of said nanostructures.

3. The optical element according to any of claims 1 and 2, wherein each layer comprises nanostructures made of a different metal.

4. The optical element according to claim 3, wherein said plurality of layers comprises a first layer having gold nanostructures sized and spaced apart to provide a resonant response to an optical field at a first wavelength, a second layer having silver nanostructures sized and spaced apart to provide a resonant response to an optical field at a second wavelength being shorter than said first wavelength, and a third layer having aluminum nanostructures sized and spaced apart to provide a resonant response to an optical field at a third wavelength being shorter than said second wavelength.

5. The optical element according to any of claims 1-4, wherein for each layer, said nanostructures are arranged to form a zone plate.

6. The optical element according to any of claims 1-5, wherein said nanostructures of said layers are arranged to focus said different wavelengths onto the same focal plane.

7. The optical element according to any of claims 1-5, wherein nanostructures of one of said layers are arranged to focus a respective wavelength to a spot at a focal plane, and nanostructures of another one of said layers are arranged to focus a respective wavelength to an annulus surrounding said spot at said focal plane.

8. The optical element according to any of claims 1-7, wherein said plurality of layers comprises two or more pairs of layers, wherein for each pair of layers, a size of- and a spacing between- nanostructures of both layers in said pair is selected to provide a resonant response to an optical field at the same wavelength.

9. An optical system, comprising a reflective element and the optical element according to any of claims 1-7 placed in front of a reflective surface of said reflective element.

10. An optical system, comprising a partially reflective partially transmissive element and the optical element according to any of claims 1-7 placed in front of a reflective side of said partially reflective partially transmissive element.

11. An optical system, comprising:

a multilayer optical element having a plurality of layers arranged along an optical axis, each layer having a plurality of nanostructures, wherein a size of- and a spacing between- said nanostructures is selected to provide a resonant response to an optical field at a different wavelength; and

a non-resonant optical element;

wherein a distance between each of said layers and said non-resonant optical element is about an integer multiplication of a quarter wavelength of a respective wavelength for which said layer provides said resonant response.

12. A method of shaping a light beam, comprising passing the light beam through the system according to any of claims 9-11.

13. An imaging system, comprising the system according to any of claims 9-11.

14. An optical reader, comprising the system according to any of claims 9-11.

15. An optical communication system, comprising the system according to any of claims 9-11.

An opto -electronic system, comprising the system according to any of claims 9-

17. An integrated optical circuit, comprising the system according to any of claims 9- 11.

18. A microscopy system, comprising the system according to any of claims 9-11.

19. A virtual reality system, comprising the system according to any of claims 9-11.

20. An augmented reality system, comprising the system according to any of claims 9- 11.

21. A method, comprising passing a light beam through the system according to any of claims 9-11 to form a hologram.

22. A method of fabricating multilayer optical element, the method comprising:

forming on a substrate a plurality of nanostructures, wherein a size of- and a spacing between- said nanostructures is selected to provide a resonant response to an optical field at a predetermined wavelength, thereby providing a first layer;

growing an additional substrate on said first layer; and

repeating said formation of nanostructures on said additional substrate for a different predetermined wavelength, thereby providing a second layer;

wherein a distance between said layers is selected to induce destructive or instructive interference of optical field components within a spectral crosstalk among said resonant responses.

23. The method according to claim 22, further comprising repeating said growing and said formation at least once, to form at least one additional layer.

24. The method according to any of claims 22 and 23, wherein for each layer, a standard deviation of a size of said nanostructures is less than 20% of an average size of said nanostructures.

25. The method according to any of claims 22-24, wherein each layer comprises nanostructures made of a different metal.

26. The method according to claim 25, wherein said plurality of layers comprises a first layer having gold nanostructures sized and spaced apart to provide a resonant response to an optical field at a first wavelength, a second layer having silver nanostructures sized and spaced apart to provide a resonant response to an optical field at a second wavelength being shorter than said first wavelength, and a third layer having aluminum nanostructures sized and spaced apart to provide a resonant response to an optical field at a third wavelength being shorter than said second wavelength.

27. The method according to any of claims 22-26, wherein for each layer, said nanostructures are arranged to form a zone plate.

28. The method according to any of claims 22-27, wherein said nanostructures of said layers are arranged to focus said different wavelengths onto the same focal plane.

29. The method according to any of claims 22-27, wherein nanostructures of one of said layers are arranged to focus a respective wavelength to a spot at a focal plane, and nanostructures of another one of said layers are arranged to focus a respective wavelength to an annulus surrounding said spot at said focal plane.