Structure for a waveguide facet

Patent metadata

Field	Value
Publication number	US-12174418-B2
Application number	US-202117792376-A
Country	US
Kind code	B2
Filing date	Jan 19, 2021
Priority date	Jan 20, 2020
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

The invention relates to an on-chip optical waveguide comprising an input or output facet, the facet comprising an array of unit-cells; each unit cell is a recess that gradually narrows in the direction from the outer of the waveguide towards the interior of the waveguide.

First claim

The invention claimed is:

1. A unitary on-chip passive optical waveguide comprising an input or output facet, the facet comprising an array of sub-wavelength size unit-cells, each unit cell is a recess that gradually narrows in the direction from the outer of the waveguide towards the interior of the waveguide, wherein the waveguide's core and each of the recessed unit cells are made of a material selected from silicon, gallium-arsenide or silicon-nitride having a refractive index higher than 2.0 and a structure selected from the group comprising cones, truncated cones, hemispherical cones, or parabolic cones.

2. The on-chip waveguide of claim 1 , wherein the unit-cell recesses are arranged on the facet in a staggered form.

3. The on-chip waveguide of claim 1 , wherein the unit-cells are arranged on the facet in a linear array form.

4. The on-chip waveguide of claim 1 , wherein each unit-cell has a diameter between 460 nm and 580 nm and a depth between 800 nm and 950 nm.

5. A chip comprising one or more unitary on-chip passive optical waveguide, wherein each unitary on-chip optical waveguide is configured according to claim 1 .

6. The chip of claim 5 , wherein the chip comprises between 10 and 200 unitary on-chip passive optical waveguides.

7. The chip of claim 5 , wherein the chip comprises at least 100 unitary on-chip passive optical waveguides.

Assignees

• B G Negev Technologies And Applications Ltd At Ben Guiron Univ
• B G Negev Technologies And Applications Ltd At Ben Gurion Univ

Inventors

• Karabchevsky Alina

Classifications

• G02B1/118

  having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures · CPC title

• G02B1/002

  made of materials engineered to provide properties not available in nature, e.g. metamaterials · CPC title

• G02B6/4207

  with optical elements reducing the sensitivity to optical feedback (anti-reflection devices specially adapted for lasers, see H01S3/0064) · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/82

  Roughened surfaces, e.g. at the interface between epitaxial layers · CPC title