Planar metalens and cover glass including the same
View Patent ↗The present disclosure provides a planar metalens and a cover glass including the planar metalens.
1. A planar metalens comprising a first lens,
the first lens comprising:
a first planar substrate on one side of which a subject is located, and
a first metasurface configured on the other side of the first planar substrate,
wherein a refractive index n 1 of the first lens, and a refractive index n 2 of an air layer present between the first lens and an image plane of the subject have a correlation of n 1 >n 2 ,
wherein the first metasurface comprises a diffraction lattice, and
wherein Equation 3 describes formation of a real image from the metalens, and Equation 5 describes formation of a virtual image from the metalens:
ϕ
(
r
)
=
-
2
π
λ
(
n
1
+
n
2
)
(
r
2
+
p
2
-
p
)
;
[
Equation
3
]
ϕ
(
r
)
=
-
2
π
λ
(
n
1
-
n
2
)
(
r
2
+
p
2
-
p
)
;
[
Equation
5
]
wherein p is a distance between the subject and the metasurface,
Φ(r) is a phase applied to light from the metasurface spaced with a distance r from an origin of the first metasurface, and
λ is a wavelength of light transmitting.
2. The planar metalens of claim 1 ,
wherein the first lens includes a material having high refractive index, the material selected from the group consisting of GaP, Si, glass, SiO 2 , TiO 2 , ZnO, Al 2 O 3 , AlN, Si 3 N 4 , Ge, ZrO 2 , SiC, and combinations thereof.
3. The planar metalens of claim 1 ,
wherein the first metasurface is formed by etching the first planar substrate or by being attached on one side of the first planar substrate.
4. The planar metalens of claim 1 ,
wherein a wavelength of light transmitting through the planar metalens is in a range of ultraviolet, visible light, infrared, or near-infrared.
5. The planar metalens of claim 1 , further comprising a second lens,
wherein the second lens comprises:
a second planar substrate contacted to the first metasurface on one side thereof, and
a second metasurface configured on the other side of the second planar substrate.
6. The planar metalens of claim 5 ,
wherein a refractive index n 1 of the first lens, a refractive index n 2 of the second lens, and a refractive index n 3 of an air layer present between the second lens and an image plane of the subject have a correlation of n 1 >n 2 >n 3 .
7. The planar metalens of claim 5 ,
wherein the first lens includes a material with high refractive index, the material selected from the group consisting of GaP, Si, glass, SiO 2 , TiO 2 , ZnO, Al 2 O 3 , AlN, Si 3 N 4 , Ge, ZrO 2 , SiC, and combinations thereof, and
wherein the second lens includes a material selected from the group consisting of polystyrenes, polycarbonates, polymethylmethacrylates, silica aerogel, GaP, Si, glass, SiO 2 , TiO 2 , ZnO, Al 2 O 3 , AlN, Si 3 N 4 , Ge, ZrO 2 , SiC, and combinations thereof.
8. The planar metalens of claim 5 ,
wherein each of the first lens and the second lens independently includes one or more corrugations.
9. The planar metalens of claim 5 ,
wherein each of the first metasurface and the second metasurface independently comprises a diffraction lattice.
10. The planar metalens of claim 5 ,
wherein the first metasurface and the second metasurface are independently formed by etching the first planar substrate and the second planar substrate, respectively, or by being attached on one side of the first planar substrate and the second planar substrate, respectively.
11. The planar metalens of claim 5 ,
wherein a wavelength of light transmitting through the planar metalens is in a range of ultraviolet, visible light, infrared, or near-infrared.
12. The planar metalens of claim 1 , further comprising a second lens and an air layer,
wherein the second lens comprises:
a second planar substrate configured apart from the first metasurface, and
a second metasurface configured on one side of the second planar substrate; and,
wherein the air layer is present between the first lens and the second lens.
13. The planar metalens of claim 12 ,
wherein a refractive index n 1 of the first lens, a refractive index n 2 of the air layer, and a refractive index n 3 of the second lens have a correlation of n 1 >n 3 >n 2 .
14. The planar metalens of claim 12 ,
wherein the first lens includes a material having high refractive index, the material selected from the group consisting of GaP, Si, glass, SiO 2 , TiO 2 , ZnO, Al 2 O 3 , AlN, Si 3 N 4 , Ge, ZrO 2 , SiC, and combinations thereof, and
wherein the second lens includes a material selected from the group consisting of polystyrenes, polycarbonates, polymethylmethacrylates, silica aerogel, GaP, Si, glass, SiO 2 , TiO 2 , ZnO, Al 2 O 3 , AlN, Si 3 N 4 , Ge, ZrO 2 , SiC, and combinations thereof.
15. The planar metalens of claim 12 ,
wherein each of the first metasurface and the second metasurface independently comprises a diffraction lattice.
16. The planar metalens of claim 12 ,
wherein the first metasurface and the second metasurface are formed by etching the first planar substrate and the second planar substrate, respectively, or by being attached on one side of the first planar substrate and the second planar substrate, respectively.
17. The planar metalens of claim 12 ,
wherein a wavelength of light transmitting through the planar metalens is in a range of ultraviolet, visible light, infrared, or near-infrared.
18. A cover glass, comprising the planar metalens according to claim 1 .