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NZ778060B2 - Metasurfaces for redirecting light and methods for fabricating - Google Patents
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NZ778060B2 - Metasurfaces for redirecting light and methods for fabricating - Google Patents

Metasurfaces for redirecting light and methods for fabricating

Info

Publication number
NZ778060B2
NZ778060B2 NZ778060A NZ77806016A NZ778060B2 NZ 778060 B2 NZ778060 B2 NZ 778060B2 NZ 778060 A NZ778060 A NZ 778060A NZ 77806016 A NZ77806016 A NZ 77806016A NZ 778060 B2 NZ778060 B2 NZ 778060B2
Authority
NZ
New Zealand
Prior art keywords
eye display
display system
spaced
apart protrusions
waveguide
Prior art date
Application number
NZ778060A
Other versions
NZ778060A (en
Inventor
Dianmin Lin
Mauro Melli
Christophe Peroz
Evgeni Poliakov
Hilaire Pierre St
Original Assignee
Magic Leap Inc
Filing date
Publication date
Application filed by Magic Leap Inc filed Critical Magic Leap Inc
Publication of NZ778060A publication Critical patent/NZ778060A/en
Publication of NZ778060B2 publication Critical patent/NZ778060B2/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
    • G02B2027/0134—Head-up displays characterised by optical features comprising binocular systems of stereoscopic type
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G02B5/1819—Plural gratings positioned on the same surface, e.g. array of gratings
    • G02B5/1823—Plural gratings positioned on the same surface, e.g. array of gratings in an overlapping or superposed manner
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/1226—Basic optical elements, e.g. light-guiding paths involving surface plasmon interaction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide

Abstract

near-eye display system comprising: a waveguide for outputting image information; an optical element disposed on a surface of the waveguide, the optical element configured to in-couple or out-couple light for providing the image information, the optical element comprising: a multilevel metasurface comprising: a plurality of spaced-apart protrusions having a pitch and formed of a first optically transmissive material; and an optically transmissive resist between the spaced-apart protrusions. The use of a multi-level metasurface allows the use of relatively low refractive index materials, while providing highly wavelength selective redirection of light, including light in the visible part of optical spectrum. This makes the metasurfaces suitable for use in near-eye display systems, whilst avoiding issue with metasurfaces manufacture.

Claims (15)

We claim:
1. A near-eye display system comprising: a waveguide for outputting image information; an optical element disposed on a surface of the waveguide, the optical element configured to in-couple or out-couple light for providing the image information, the optical element comprising: a multilevel metasurface comprising: a plurality of spaced-apart protrusions having a pitch and formed of a first optically transmissive material; and an optically transmissive resist between the spaced-apart protrusions.
2. The near-eye display system of Claim 1, wherein the plurality of spaced-apart protrusions are formed of resist having a different refractive index than the optically transmissive resist between the spaced-apart protrusions.
3. The near-eye display system of Claim 2, wherein the optically transmissive resist between the spaced-apart protrusions has a higher refractive index than material forming the plurality of spaced-apart protrusions.
4. The near-eye display system of Claim 3, wherein the optically transmissive resist between the spaced-apart protrusions has a higher refractive index than material forming the waveguide.
5. The near-eye display system of any one of the Claims 1 to 4, wherein upper surfaces of the plurality of spaced-apart protrusions and the optically transmissive resist between the spaced-apart protrusions define a planar surface.
6. The near-eye display system of any one of the Claims 1 to 5, wherein the optically transmissive resist between the spaced-apart protrusions extends over the plurality of spaced- apart protrusions to define a continuous layer of resist above the plurality of spaced-apart protrusions.
7. The near-eye display system of any one of the Claims 1 to 6, further comprising a layer of resist underlying the plurality of spaced-apart protrusions.
8. The near-eye display system of any one of the Claims 1 to 7, wherein the pitch of the protrusions varies across the surface of the waveguide.
9. The near-eye display system of any one of the Claims 1 to 8, further comprising an image injection device configured to inject light comprising the image information into the waveguide.
10. The near-eye display system of Claim 9, wherein the optical element is an in- coupling optical element, wherein the image injection device is configured to inject light into the waveguide through the in-coupling optical element.
11. The near-eye display system of any one of the Claims 1 to 10, wherein the waveguide is one of a stack of waveguides, wherein each of the stack of waveguides comprises an associated multilevel metasurface.
12. The near-eye display system of Claim 11, wherein the associated multilevel metasurfaces of at least some of the waveguides are configured to redirect light of different ranges of wavelengths than the associated multilevel metasurfaces of others of the waveguides.
13. The near-eye display system of any one of the Claims 1 to 12, wherein the pitch is in a range of 10-600 nm.
14. The near-eye display system of any one of the Claims 1 to 13, wherein the metasurface is a bi-level metasurface.
15. The near-eye display system of any one of the Claims 1 to 14, wherein the metasurface is a tri-level metasurface.
NZ778060A 2016-11-03 Metasurfaces for redirecting light and methods for fabricating NZ778060B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201562252315P 2015-11-06 2015-11-06
US201562252929P 2015-11-09 2015-11-09
NZ758893A NZ758893B2 (en) 2016-11-03 Metasurfaces for redirecting light and methods for fabricating

Publications (2)

Publication Number Publication Date
NZ778060A NZ778060A (en) 2024-04-26
NZ778060B2 true NZ778060B2 (en) 2024-07-30

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