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US 12,607,920 B2Granted
Folded projection and detection system
AssigneeApple Inc.
InventorsMoshe Kriman, Maoz Ovadia, Dana Gal-Fuss
Life of this patent
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Abstract
An optical device includes a substrate that includes a parallelepiped of a transparent dielectric material. The substrate is configured for propagation of a beam of optical radiation through the substrate along a beam path that includes multiple internal reflections within the substrate. The device further includes first and second optical metasurfaces disposed on one or more faces of the substrate at different, first and second points of incidence of the beam path with the one or more faces.
Claims18
An optical device, comprising:
- a substrate comprising a parallelepiped of a transparent dielectric material configured for propagation of a beam of optical radiation through the substrate along a beam path that includes multiple internal reflections within the substrate;
- and
- first and second optical metasurfaces disposed respectively on opposing, first and second faces of the substrate at different, first and second points of incidence of the beam path with the one or more faces.
An optical device, comprising:
- a substrate comprising a parallelepiped of a transparent dielectric material configured for propagation of a beam of optical radiation through the substrate along a beam path that includes multiple internal reflections within the substrate;
- first and second optical metasurfaces disposed on one or more faces of the substrate at different, first and second points of incidence of the beam path with the one or more faces;
- and
- one or more reflectors disposed on one or more of the faces at one or more further points of incidence of the beam path with the one or more faces,
- wherein the one or more reflectors are disposed respectively on first and second side faces of the substrate, which are angled obliquely relative to the entrance and exit faces.
2 more elements
An optoelectronic apparatus, comprising:
- an emitter configured to emit a beam of coherent optical radiation;
- an optical substrate comprising a parallelepiped of a transparent dielectric material positioned to intercept the beam emitted by the emitter and configured for propagation of the beam through the optical substrate along a beam path that includes multiple internal reflections within the substrate;
- at least first and second optical metasurfaces disposed on one or more faces of the optical substrate at different, first and second points of incidence of the beam path with the one or more faces, and configured to couple the beam out of the substrate while splitting the beam into multiple output beams,
- wherein the at least first and second optical metasurfaces are configured to collimate the multiple output beams so as to project a pattern of spots onto a target;
- and
- an imaging device, which comprises a detector array and one or more metasurface optical elements, which are configured to image the target onto the detector array.
3 more elements
Dependencies are inferred from the claim text.