US 2026/0282755 A1Published application

Light detection element

AssigneeTDK Corporation

InventorsTakekazu YAMANE, Takeshi NOJIRI, Tomohito MIZUNO, Tetsuya SHIBATA, Hideaki FUKUZAWA

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Abstract

A light detection element includes a first magnetic element and a second magnetic element, a first lens that irradiates incident light to the first magnetic element, and a second lens that irradiates incident light to the second magnetic element. The first lens and the second lens are made of metalenses having a plurality of nanostructures arranged two-dimensionally. In order to make the phases at the focal points of the first lens and the second lens different from each other, the size of the plurality of nanostructures in the first lens decreases as the distance from the optical center of the first lens increases in a predetermined region determined according to the distance from the optical center, and the size of the plurality of nanostructures in the second lens decreases as the distance from the optical center increases in a predetermined region determined according to the distance from the optical center.

Claims20

Dependent claims

A light detection element comprising:

a first magnetic element and a second magnetic element, each of which comprises a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer;
a first lens consisting of a metalens having a plurality of nanostructures arranged two-dimensionally, which irradiates incident light to the first magnetic element;
and
a second lens consisting of a metalens having a plurality of nanostructures arranged two-dimensionally, which irradiates the incident light to the second magnetic element,
wherein
the size of the plurality of nanostructures in the first lens in a plan view from the optical axis direction of the first lens decreases as the distance from the optical center of the first lens increases in each region defined by the discontinuity points of equation (1) as boundaries, and
the size of the plurality of nanostructures in the second lens in a plan view from the optical axis direction of the second lens decreases as the distance from the optical center of the second lens increases in each region defined by the discontinuity points of equation (2) as boundaries.
ϕ
⁡
(
r
)
=
-
2
⁢
π
(
f
2
+
(
r
-
a
1
)
2
-
f
λ
-
floor
(
f
2
+
(
r
-
a
1
)
2
-
f
λ
)
)
(
1
)
ϕ
⁡
(
r
)
=
-
2
⁢
π
(
f
2
+
(
r
-
a
2
)
2
-
f
λ
-
floor
(
f
2
+
(
r
-
a
2
)
2
-
f
λ
)
)
+
Δϕ
(
2
)
(In the above equations (1) and (2), r is the distance from the origin, f is the focal length of the first lens and the second lens, λ is the wavelength of the incident light, φ is the phase, a1 is the distance from the origin to the optical center of the first lens, a2 is the distance from the origin to the optical center of the second lens, Δφ is the phase difference, and floor is the floor function.)

97 more elements

A light detection element comprising:

a plurality of magnetic elements, each of which includes a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer;
and
a plurality of lenses, each of which irradiates light onto a corresponding one of the plurality of magnetic elements, wherein
the plurality of lenses are each made of a metalens having a plurality of nanostructures arranged two-dimensionally, and the size of the plurality of nanostructures in one of the adjacent lenses in a plan view seen from the optical axis direction of the one lens decreases as the distance from the optical center of the one lens increases in each region defined by the discontinuity points of equation (1) as boundaries, and the size of the plurality of nanostructures in the other of the adjacent lenses in a plan view seen from the optical axis direction of the other lens decreases as the distance from the optical center of the other lens increases in each region defined by the discontinuity points of equation (2) as boundaries.
ϕ
⁡
(
r
)
=
-
2
⁢
π
(
f
2
+
(
r
-
a
1
)
2
-
f
λ
-
floor
(
f
2
+
(
r
-
a
1
)
2
-
f
λ
)
)
(
1
)
ϕ
⁡
(
r
)
=
-
2
⁢
π
(
f
2
+
(
r
-
a
2
)
2
-
f
λ
-
floor
(
f
2
+
(
r
-
a
2
)
2
-
f
λ
)
)
+
Δϕ
(
2
)
(In the above equations (1) and (2), r is the distance from the origin, f is the focal length of the adjacent lenses, λ is the wavelength of the incident light, φ is the phase, a1 is the distance from the origin to the optical center of the one lens, a2 is the distance from the origin to the optical center of the other lens, A is the phase difference, and floor is the floor function.)

94 more elements

Dependencies are inferred from the claim text.