Polarization control device
A polarization control device includes a support substrate on which a metal compound structure is formed. The metal compound structure is formed with at least two metal fine structures arranged periodically in a range equal to or smaller than a wavelength of an incident light.
1. A polarization control device comprising:
a support substrate on which a metal compound structure is formed, wherein
the metal compound structure is formed with at least two metal fine structures arranged periodically in a range equal to or smaller than a wavelength of an incident light, and wherein
a surface structure of the support substrate is formed on a curved surface having a modulation period larger than the wavelength of the incident light.
2. The polarization control device of claim 1 , wherein
each of said at least two metal fine structures has a size less than or equal to 100 nm.
3. The polarization control device according to claim 1 , wherein the metal compound structure is obtained by depositing a first metal material, a dielectric material, and a second metal material.
4. The polarization control device according to claim 1 , wherein the metal fine structures are formed with at least one of silver, gold, platinum, aluminum, and copper, which generate a plasmon.
5. The polarization control device according to claim 1 , wherein the metal compound structure is formed by a periodic structure arranged in one of a square lattice array and a hexagonal lattice array.
6. The polarization control device according to claim 1 , wherein the metal compound structure is formed with the metal fine structures arranged in an asymmetric manner.
7. The polarization control device according to claim 1 , wherein the metal compound structure is arranged two-dimensionally on the support substrate at a distance smaller than the wavelength of the incident light.
8. The polarization control device according to claim 7 , wherein the metal compound structure is formed with two metal fine structures.
9. The polarization control device according to claim 7 , wherein the metal compound structure is formed with the metal fine structures arranged in an L-shape.
10. The polarization control device according to claim 7 , wherein the metal compound structure is formed with the metal fine structures arranged in a T-shape.
11. The polarization control device according to claim 7 , wherein the metal compound structure is formed with the metal line structures arranged in a swastika-shape.
12. The polarization control device according to claim 7 , wherein a light incident on the metal fine structures is incident at an angle at which the light contains a polarization component in a direction asymmetric with respect to the metal fine structures.
13. The polarization control device according to claim 1 , wherein the support substrate is formed with a dielectric material.
14. The polarization control device according to claim 1 , wherein the metal fine structures are at least two types of metals or alloys of at least two types of metals.
15. The polarization control device according to claim 1 , wherein the support substrate is formed in a lens-shape.
16. The polarization control device according to claim 1 , wherein the support substrate is formed in a micro-lens array-shape.
17. The polarization control device according to claim 1 , wherein the metal compound structure is formed by a linearly arrayed periodic structure.
18. A polarization control device comprising:
a support substrate; and
a periodic structure provided on a surface of the support substrate, wherein
a surface structure of the support substrate is formed on a curved surface having a modulation period larger than a wavelength of an incident light,
a height is periodically modulated and the periodic structure is formed with a period smaller than the wavelength of the incident light,
a metal compound structure is formed on the periodic structure and is formed with at least two metal fine structures arranged periodically in a range equal to or smaller than the wavelength of the incident light, and
said at least two metal fine structures are configured to produce a plasmon vibration for causing a desired light modulation effect.
19. The polarization control device according to claim 18 , wherein an area ratio of a concave portion to a convex portion per unit period in the periodic structure of the support substrate is modulated in an entire area or a part of a surface of the support substrate.
20. The polarization control device according to claim 18 , wherein the metal compound structure is arranged on either one of a convex portion and a concave portion in the periodic structure of the support substrate.
21. A polarization control device comprising:
a support substrate; and
a periodic structure provided on a surface of the support substrate, wherein
a metal compound structure is formed on the periodic structure, and the metal compound structure is formed with at least two metal fine structures arranged periodically in a range equal to or smaller than a wavelength of an incident light,
wherein a surface structure of the support substrate is formed on a curved surface having a modulation period larger than the wavelength of the incident light.