# US 11,307,408 B2 · Color-selective waveguides for augmented reality/mixed reality applications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,408 B2 - Document ID: US11307408B2 - Status: Granted - Kind: B2 - Application number: 17/065,905 - Filed: 2020-10-08 - Published: 2021-04-08 - Granted: 2022-04-19 - Earliest claimed: 2019-10-08 - Assignees: Magic Leap, Inc. - Applicants: Magic Leap, Inc. - Inventors: Sharad D. Bhagat; David Carl Jurbergs; Ryan Jason Ong; Christophe Peroz; Chieh Chang; Ling Li - Web page: https://patentgrep.com/patent/US11307408B2 ## CPC - G02B 27/0025: {for optical correction, e.g. distorsion, aberration} - B29D 11/00634: {Production of filters} - B29D 11/00663: {Production of light guides} - B29D 11/00769: {Producing diffraction gratings} - G02B 5/22: Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} - G02B 6/0026: {Wavelength selective element, sheet or layer, e.g. filter or grating} - G02B 6/0065: {Manufacturing aspects; Material aspects} - G02B 27/0081: {with means for altering, e.g. enlarging, the entrance or exit pupil} - G02B 27/0172: {characterised by optical features} - G02B 27/4272: {having plural diffractive elements positioned sequentially along the optical path} - B29K 2995/002: Coloured - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract Color-selective waveguides, methods for fabricating color-selective waveguides, and augmented reality (AR)/mixed reality (MR) applications including color-selective waveguides are described. The color-selective waveguides can advantageously reduce or block stray light entering a waveguide (e.g., red, green, or blue waveguide), thereby reducing or eliminating back-reflection or back-scattering into the eyepiece. ## Claims ### Claim 1 A doped polymer waveguide comprising: one or more patterned regions; and one or more unpatterned regions, wherein the one or more patterned regions and the one or more unpatterned regions comprise a doped polymer, the doped polymer comprising a chromatic component selected to absorb at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide, and wherein the doped polymer is a homogeneous material. ### Claim 2 (depends on 1) The polymer waveguide of claim 1, wherein one of the one or more patterned regions is an incoupling grating, an exit pupil expander, or an orthogonal pupil expander. ### Claim 3 (depends on 1) The polymer waveguide of claim 1, wherein the doped polymer waveguide is free of one or more undoped regions. ### Claim 4 (depends on 1) The polymer waveguide of claim 1, wherein the doped polymer waveguide absorbs at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide. ### Claim 5 (depends on 1) The polymer waveguide of claim 1, wherein a thickness of the doped polymer waveguide is in a range of about 200 μm to about 1000 μm. ### Claim 6 (depends on 1) The polymer waveguide of claim 1, wherein a total internal reflection path length of the doped polymer waveguide is in a range of about 2 cm to about 15 cm. ### Claim 7 (depends on 1) The polymer waveguide of claim 1, wherein a refractive index of the doped polymer waveguide is greater than about 1.45. ### Claim 8 (depends on 1) The polymer waveguide of claim 1, wherein the chromatic component is selected to absorb at least 90% of only red light, only green light, or only blue light. ### Claim 9 (depends on 1) An eyepiece comprising the polymer waveguide of claim 1. ### Claim 10 A method of forming a doped polymer waveguide, the method comprising: dispensing a polymerizable material on a first mold, wherein the polymerizable material comprises a resin and a chromatic component; contacting the polymerizable material with a second mold, wherein the first mold, the second mold, or both comprises protrusions, recessions, or both; polymerizing the polymerizable material to yield a patterned polymer layer between the first mold and the second mold; and separating the patterned polymer layer from the first mold and the second mold to yield the doped polymer waveguide, wherein the chromatic component is selected to absorb red light, green light, blue light, or any combination thereof, and wherein the polymerizable material is a homogeneous mixture. ### Claim 11 (depends on 10) The method of claim 10, wherein the doped polymer waveguide is free of one or more undoped regions. ### Claim 12 (depends on 10) The method of claim 10, wherein the doped polymer waveguide absorbs at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide. ### Claim 13 (depends on 10) The method of claim 10, wherein a thickness of the doped polymer waveguide is in a range of about 200 μm to about 1000 μm. ### Claim 14 (depends on 10) The method of claim 10, wherein a total internal reflection path length of the doped polymer waveguide is in a range of about 2 cm to about 15 cm. ### Claim 15 (depends on 10) The method of claim 10, wherein the contacting the separating comprise casting or molding. ### Claim 16 (depends on 10) The method of claim 10, wherein a refractive index of the doped polymer waveguide is greater than about 1.45. ### Claim 17 (depends on 10) The method of claim 10, wherein the chromatic component is selected to absorb at least 90% of only red light, only green light, or only blue light. ### Claim 18 (depends on 10) The method of claim 10, wherein polymerizing the polymerizable material comprises irradiating the polymerizable material with ultraviolet radiation. ### Claim 19 A doped polymer waveguide comprising: one or more patterned regions; and one or more unpatterned regions, wherein the one or more patterned regions and the one or more unpatterned regions comprise a doped polymer, the doped polymer comprising a chromatic component selected to absorb at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide, and wherein a total internal reflection path length of the doped polymer waveguide is in a range of about 2 cm to about 15 cm. ### Claim 20 (depends on 19) The polymer waveguide of claim 19, wherein one of the one or more patterned regions is an incoupling grating, an exit pupil expander, or an orthogonal pupil expander. ### Claim 21 (depends on 19) The polymer waveguide of claim 19, wherein the doped polymer waveguide is free of one or more undoped regions. ### Claim 22 (depends on 19) The polymer waveguide of claim 19, wherein the doped polymer waveguide absorbs at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide. ### Claim 23 (depends on 19) The polymer waveguide of claim 19, wherein the doped polymer is a homogeneous material. ### Claim 24 (depends on 19) The polymer waveguide of claim 19, wherein a thickness of the doped polymer waveguide is in a range of about 200 μm to about 1000 μm. ### Claim 25 (depends on 19) The polymer waveguide of claim 19, wherein a refractive index of the doped polymer waveguide is greater than about 1.45. ### Claim 26 (depends on 19) The polymer waveguide of claim 19, wherein the chromatic component is selected to absorb at least 90% of only red light, only green light, or only blue light. ### Claim 27 (depends on 19) An eyepiece comprising the polymer waveguide of claim 19. ### Claim 28 A method of forming a doped polymer waveguide, the method comprising: dispensing a polymerizable material on a first mold, wherein the polymerizable material comprises a resin and a chromatic component; contacting the polymerizable material with a second mold, wherein the first mold, the second mold, or both comprises protrusions, recessions, or both; polymerizing the polymerizable material to yield a patterned polymer layer between the first mold and the second mold; and separating the patterned polymer layer from the first mold and the second mold to yield the doped polymer waveguide, wherein the chromatic component is selected to absorb red light, green light, blue light, or any combination thereof, and wherein a total internal reflection path length of the doped polymer waveguide is in a range of about 2 cm to about 15 cm. ### Claim 29 (depends on 28) The method of claim 28, wherein the doped polymer waveguide is free of one or more undoped regions. ### Claim 30 (depends on 28) The method of claim 28, wherein the doped polymer waveguide absorbs at least 90% of one or more of red light, green light, and blue light traveling through the polymer waveguide. ### Claim 31 (depends on 28) The method of claim 28, wherein the polymerizable material is a homogeneous mixture. ### Claim 32 (depends on 28) The method of claim 28, wherein a thickness of the doped polymer waveguide is in a range of about 200 μm to about 1000 μm. ### Claim 33 (depends on 28) The method of claim 28, wherein the contacting the separating comprise casting or molding. ### Claim 34 (depends on 28) The method of claim 28, wherein a refractive index of the doped polymer waveguide is greater than about 1.45. ### Claim 35 (depends on 28) The method of claim 28, wherein the chromatic component is selected to absorb at least 90% of only red light, only green light, or only blue light. ### Claim 36 (depends on 28) The method of claim 28, wherein polymerizing the polymerizable material comprises irradiating the polymerizable material with ultraviolet radiation.