US 2026/0276450 A1Published application

Light detection element

AssigneeTDK Corporation

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

Life of this patent

Estimating the term…

Loading patent…

Abstract

A light detection element includes a magnetic element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first and second ferromagnetic layers, and a main lens 21 and at least one sub-lens 22 that focus incident light to the magnetic element. The main lens and the sub-lens are metalenses 25 including a plurality of nanostructures 26. The planar size of the multiple nanostructures in the main lens decreases as the distance from the optical center of the main lens increases in each region determined according to the distance from the optical center of the main lens, and the planar size of the multiple nanostructures in the sub-lens decreases as the distance from the optical center of the sub-lens increases in each region determined according to the distance from the optical center of the sub-lens.

Claims20

Dependent claims

A light detection element comprising:

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

90 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/564,529Filed 12 Mar 2026
Priority: JP 2025-04174914 Mar 2025
Published: 17 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01J 5/0806
Optical arrangements: focusing or collimating elements, e.g. lenses or concave mirrors
G01J 1/0411
Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings: using focussing or collimating elements, i.e. lenses or…
G01J 5/10
Radiation pyrometry, e.g. infrared or optical thermometry: using electric radiation detectors
H04B 10/40
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing…