US 2026/0299203 A1 · OPTICAL SYSTEM

Abstract

An optical system 101 includes a core 1A, a Si waveguide 2A having a light spot size different from that of the core 1A, and a metalens 3 optically connecting the core 1A and the Si waveguide 2A. The metalens has a first surface 31A facing the first waveguide and a second surface 31B facing a side opposite to the first surface. The metalens is provided with a through hole 31C penetrating between the first surface and the second surface. The through hole has a hole diameter smaller than a target wavelength. The metalens is made of a conductor. The first surface of the metalens is formed with a plurality of uneven structures including the first surface and a plurality of annular grooves 31D recessed with respect to the first surface. The plurality of uneven structures are annularly formed so as to surround the through hole in plan view.

Claims20

Dependent claims

An optical system comprising:

a first waveguide;
a second waveguide having a light spot size different from a light spot size of the first waveguide;
and
a metalens optically connecting a first end face of the first waveguide and a second end face of the second waveguide,
wherein the metalens includes a first surface facing the first waveguide and a second surface facing a side opposite to the first surface,
the metalens is formed with a through hole penetrating between the first surface and the second surface,
the through hole has a hole diameter smaller than a target wavelength,
the metalens is made of a conductor,
at least the first surface of the metalens is formed with a plurality of uneven structures including the first surface and a plurality of annular grooves recessed with respect to the first surface, and
the plurality of uneven structures are annularly formed surrounding the through hole in plan view.

7 more elements

An optical system comprising:

a first waveguide;
a second waveguide having a light spot size different from a light spot size of the first waveguide;
a metalens optically connecting a first end face of the first waveguide and a second end face of the second waveguide;
and
a substrate having a third surface that is transparent to light having a target wavelength and intersects with a propagation direction of the light,
wherein the metalens is a phase grating that is disposed on the third surface and gives a phase difference to the light having the target wavelength,
the metalens includes a plurality of protrusions disposed on the third surface at an interval between each other, and
each of the plurality of protrusions includes a first group of protrusions disposed at an interval between each other on a first region of the third surface and a second group of protrusions disposed at an interval between each other on a second region of the third surface, and at least one of a height, a maximum width, and a pitch of each of the first group of protrusions is different from at least one of a height, a maximum width, and a pitch of each of the second group of protrusions.

5 more elements

Dependencies are inferred from the claim text.

Optical system

Life of this patent

Optical system

Life of this patent

Abstract

Claims20