Reflective optical device
A reflective optical device has an insulation layer, a lattice group, a rear surface electrode, and a voltage application unit. Lattice group is composed of a plurality of lattices including a lattice and a lattice. Each of the plurality of lattices has a structure in which dielectric layer and graphene layer are laminated. Voltage application unit has a function of individually applying a voltage to each of lattice group. Voltage application unit includes a voltage application unit to apply a first voltage to lattice, and a voltage application unit to apply a second voltage to lattice.
1. A reflective optical device that makes a reflection direction of an incoming electromagnetic wave variable, the reflective optical device comprising:
an insulator having a first surface and a second surface that are opposed to each other;
a laminated structure part disposed facing the first surface of the insulator;
an electrode part electrically connected with the laminated structure part, to which a voltage is applied; and
a reflective plate disposed facing the second surface of the insulator,
the laminated structure part having a plurality of laminated structures including:
a plurality of first laminated structures having a first width in a first direction, and extending in a second direction that intersects with the first direction, and
a plurality of second laminated structures disposed apart from the first laminated structures in the first direction, having a second width in the first direction and extending in the second direction,
in each of the plurality of laminated structures, a dielectric layer and a first two-dimensional material layer being laminated,
the electrode part having a plurality of electrodes including:
a first electrode that is electrically connected with the first two-dimensional material layer in the first laminated structure, to which a first voltage is applied, and
a second electrode that is electrically connected with the first two-dimensional material layer in the second laminated structure, to which a second voltage is applied,
each of the first laminated structure and the second laminated structure includes a second two-dimensional material layer,
the first two-dimensional material layer is laminated on the second two-dimensional material layer with the dielectric layer interposed therebetween,
the first two-dimensional material layer, the dielectric layer and the second two-dimensional material layer are separated from each other between the plurality of first laminated structures,
the first two-dimensional material layer, the dielectric layer and the second two-dimensional material layer are separated from each other between the plurality of second laminated structures,
a first refractive index of the first two-dimensional material layer in the first laminated structure is varied by the first voltage,
a second refractive index of the first two-dimensional material layer in the second laminated structure is varied by the second voltage, and
the laminated structure part includes:
a first lattice which is a first lattice group including the first laminated structure, and
a second lattice which is a second lattice group including the second laminated structure, wherein
between the insulator and the reflective plate, a substrate in which photoelectric conversion is caused by the incoming electromagnetic wave is disposed.
2. The reflective optical device according to claim 1 , wherein the first laminated structure and the second laminated structure have a same structure.
3. The reflective optical device according to claim 1 , wherein
the first lattice includes a plurality of the first laminated structures having the first width in the first direction, and a first length in the second direction and arranged in the first direction at a first pitch, and
the second lattice includes a plurality of the second laminated structures having the second width in the first direction, and a second length in the second direction and arranged in the first direction at a second pitch.
4. The reflective optical device according to claim 1 , wherein in the first lattice and the second lattice, at least one of a first condition that the first width and the second width are different from each other, a second condition that the first length and the second length are different from each other, a third condition that the first pitch and the second pitch are different from each other, or a fourth condition that a thickness of the dielectric layer in the first lattice and a thickness of the dielectric layer in the second lattice are different from each other is set.
5. The reflective optical device according to claim 3 , wherein in the first lattice and the second lattice, the first condition is set.
6. The reflective optical device according to claim 1 , wherein
letting n be a natural number of greater than or equal to 3,
a plurality of the laminated structures include three or more laminated structures from the first laminated structure to an n-th laminated structure including the first laminated structure and the second laminated structure, and
a plurality of the electrodes include three or more electrodes from the first electrode to an n-th electrode formed in the three or more laminated structures from the first laminated structure to the n-th laminated structure, including the first electrode and the second electrode.
7. The reflective optical device according to claim 6 , wherein
the laminated structure part is a lattice group including three or more laminated structures as a plurality of lattices, and
letting i and j be natural numbers of greater than or equal to 1 and less than or equal to n that are different from each other, one laminated structure of the three or more laminated structures from the first laminated structure to the n-th laminated structure be an i-th laminated structure, and another laminated structure be a j-th laminated structure,
the laminated structure part includes:
the i-th laminated structure as an i-th lattice; and
the j-th laminated structure as a j-th lattice,
the i-th lattice includes a plurality of the i-th laminated structures having a third width in the first direction, and a third length in the second direction, and arranged in the first direction at a third pitch, and
the j-th lattice includes a plurality of the j-th laminated structures having a fourth width in the first direction, and a fourth length in the second direction, and arranged in the first direction at a fourth pitch.
8. The reflective optical device according to claim 7 , wherein in the i-th lattice and the j-th lattice, at least one of a fifth condition that the third width and the fourth width are different from each other, a sixth condition that the third length and the fourth length are different from each other, a seventh condition that the third pitch and the fourth pitch are different from each other, or an eighth condition that a thickness of the dielectric layer in the i-th lattice and a thickness of the dielectric layer in the j-th lattice are different from each other is set.
9. The reflective optical device according to claim 1 , wherein the laminated structure part is arranged plurally in a one-dimensional form or in a two-dimensional form.
10. The reflective optical device according to claim 1 , wherein either of the first two-dimensional material layer and the second two-dimensional material layer is composed of an atomic layer of a monolayer or two or more layers.
11. The reflective optical device according to claim 1 , wherein either of the first two-dimensional material layer and the second two-dimensional material layer contains a material selected from the group consisting of graphene, transition metal dichalcogenide, black phosphorus, silicene, graphene nanoribbon, and borophene.
12. The reflective optical device according to claim 1 , comprising an electromagnetic wave detection unit to detect the electromagnetic wave, the electromagnetic wave detection unit including:
a first detection electrode and a second detection electrode formed on the substrate, and
a third two-dimensional material layer formed to be interposed between the first detection electrode and the second detection electrode.
13. The reflective optical device according to claim 12 , wherein the third two-dimensional material layer is in contact with the substrate.
14. The reflective optical device according to claim 12 , wherein the electromagnetic wave detection unit is disposed in a plurality of sites in the substrate.
15. The reflective optical device according to claim 1 , wherein the laminated structure part is formed in a size shorter than a wavelength of the electromagnetic wave.
16. A reflective optical device that makes a reflection direction of an incoming electromagnetic wave variable, the reflective optical device comprising:
an insulator having a first surface and a second surface that are opposed to each other;
a laminated structure part disposed facing the first surface of the insulator;
an electrode part electrically connected with the laminated structure part, to which a voltage is applied; and
a reflective plate disposed facing the second surface of the insulator,
the laminated structure part having a plurality of laminated structures including:
a first laminated structure having a first width in a first direction, and extending in a second direction that intersects with the first direction, and
a second laminated structure disposed apart from the first laminated structure in the first direction, having a second width in the first direction and extending in the second direction,
in each of the plurality of laminated structures, a dielectric layer and a first two-dimensional material layer being laminated,
the electrode part having a plurality of electrodes including:
a first electrode that is electrically connected with the first two-dimensional material layer in the first laminated structure, to which a first voltage is applied, and
a second electrode that is electrically connected with the first two-dimensional material layer in the second laminated structure, to which a second voltage is applied,
a first refractive index of the first two-dimensional material layer in the first laminated structure is varied by the first voltage, and
a second refractive index of the first two-dimensional material layer in the second laminated structure is varied by the second voltage, wherein
between the insulator and the reflective plate, a substrate in which photoelectric conversion is caused by the incoming electromagnetic wave is disposed.
17. The reflective optical device according to claim 16 , wherein the first two-dimensional material layer contains a material selected from the group consisting of graphene, transition metal dichalcogenide, black phosphorus, silicene, graphene nanoribbon, and borophene.