Optical device, manufacturing method thereof, and method of manufacturing master

1. An optical device that has an antireflection function, the optical device comprising:

a base; and

a plurality of structural bodies, which are formed by convex portions or concave portions, arranged on a surface of the base with a fine pitch that is equal to or smaller than a wavelength of visible light,

wherein the plurality of structural bodies are arranged so as to form tracks of a plurality of rows on the surface of the base and form a quasi-hexagonal lattice pattern, a tetragonal lattice pattern, or a quasi-tetragonal lattice pattern,

wherein a packing ratio of the structural bodies to the surface of the base is equal to or higher than 65%, and

wherein:

(i) the plurality of structural bodies form a hexagonal lattice pattern or a quasi-hexagonal lattice pattern on the surface of the base, and wherein, when an arrangement pitch of the plurality of structural bodies within a same track is P 1 and an arrangement pitch of the plurality of structural bodies between two adjacent tracks is P 2 , a ratio of P 1 /P 2 satisfies relationship of 1.00≦P 1 /P 2 ≦1.1 or 1.00<P 1 /P 2 ≦1.1, or

(ii) the plurality of structural bodies form a tetragonal lattice pattern or a quasi-tetragonal lattice pattern on the surface of the base, and wherein, when an arrangement pitch of the plurality of structural bodies within a same track is P 1 and an arrangement pitch of the plurality of structural bodies between two adjacent tracks is P 2 , a ratio of P 1 /P 2 satisfies relationship of 1.4<P 1 /P 2 ≦1.5.

2. The optical device according to claim 1 , wherein the packing ratio of the structural bodies to the surface of the base is equal to or higher than 73%.

3. The optical device according to claim 2 , wherein the packing ratio of the structural bodies to the surface of the base is equal to or higher than 86%.

4. The optical device according to claim 1 ,

wherein the plurality of structural bodies are arranged so as to form tracks of a plurality of rows that have a linear shape and form a quasi-hexagonal lattice pattern, and

wherein a height or depth of the structural body in an extending direction of the tracks is smaller than a height or depth of the structural body in a row direction of the tracks.

5. The optical device according to claim 1 ,

wherein the plurality of structural bodies are arranged so as to form tracks of a plurality of rows that have a linear shape and form a tetragonal lattice pattern or a quasi-tetragonal lattice pattern, and

wherein a height or depth of the structural body in an arrangement direction that is tilted with respect to an extending direction of the tracks is smaller than a height or depth of the structural body in an extending direction of the tracks.

6. The optical device according to claim 1 , wherein an arrangement pitch P 1 of the plurality of structural bodies within a same track is longer than an arrangement pitch P 2 of the plurality of structural bodies between two adjacent tracks.

7. A display device comprising the optical device according to claim 1 .

8. A package comprising the optical device according to claim 1 .

9. An optical device that has an antireflection function, the optical device comprising:

a base; and

a plurality of structural bodies, which are formed by convex portions or concave portions, arranged on a surface of the base with a fine pitch that is equal to or smaller than a wavelength of visible light,

wherein the plurality of structural bodies are arranged so as to form tracks of a plurality of rows on the surface of the base and form a quasi-hexagonal lattice pattern, and

wherein, when an arrangement pitch of the plurality of structural bodies within a same track is P 1 and a diameter of a bottom surface of the structural body in a direction of the tracks is 2r, a ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 85%.

10. The optical device according to claim 9 , wherein the ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 90%.

11. The optical device according to claim 10 , wherein the ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 95%.

12. The optical device according to claim 9 , wherein the structural bodies have a circular cone shape, a circular truncated cone shape, an elliptic cone shape, or an elliptic truncated cone shape.

13. An optical device that has an antireflection function, the optical device comprising:

a base; and

a plurality of structural bodies, which are formed by convex portions or concave portions, arranged on a surface of the base with a fine pitch that is equal to or smaller than a wavelength of visible light,

wherein the plurality of structural bodies are arranged so as to form tracks of a plurality of rows on the surface of the base and form a tetragonal lattice pattern or a quasi-tetragonal lattice pattern, and

wherein, when an arrangement pitch of the plurality of structural bodies within a same track is P 1 and a diameter of a bottom surface of the structural body in a direction of the tracks is 2r, a ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 64%.

14. The optical device according to claim 13 , wherein the ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 69%.

15. The optical device according to claim 14 , wherein the ratio ((2r/P 1 )×100) of the diameter 2r to the arrangement pitch P 1 is equal to or higher than 73%.

16. The optical device according to claim 13 , wherein the structural bodies have a circular cone shape, a circular truncated cone shape, an elliptic cone shape, or an elliptic truncated cone shape.