公开(公告)号：US20230025649A1

公开(公告)日：2023-01-26

申请号：US17382134

申请日：2021-07-21

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Gangadhara Raja MUTHINTI ,  Vivek GUPTA

IPC: G01N21/21 ,  G01B11/06

Abstract: Various embodiments set forth techniques for characterizing films on optically clear substrates using ellipsometry. In some embodiments, a spectroscopic ellipsometer is configured to generate a light beam that has a relatively small spot size and is substantially absorbed by an optically clear substrate, thereby reducing or eliminating reflections from an interface between the substrate and air. Optical simulations can be performed to determine values for various parameters associated with the ellipsometer that minimize the reflections from the interface between the substrate and air and maximize reflections from an interface between a film and the substrate. In addition, graded films that include multiple layers can be analyzed using models of multiple layers.

公开(公告)号：US20250093560A1

公开(公告)日：2025-03-20

申请号：US18825830

申请日：2024-09-05

Applicant: Meta Platforms Technologies, LLC

Inventor： Richard FARRELL ,  Hee Yoon LEE ,  Vivek GUPTA

IPC: G02B5/18 ,  F21V8/00 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B6/132 ,  G02B27/00 ,  G02B27/01 ,  G02B27/42

Abstract: A method of fabricating a layered waveguide display comprises imprinting a surface-relief grating (SRG) on a first substrate, filling grating grooves of the SRG with a backfill material, depositing a first layer of an index-matching material on the SRG, and bonding the first layer of the index-matching material on the SRG to a first side of a second substrate. The first substrate and the SRG are characterized by a first refractive index and a second refractive index, respectively. The backfill material is characterized by a third refractive index greater than the first refractive index and the second refractive index. The index-matching material is characterized by a fourth refractive index greater than the first refractive index and the second refractive index. In some embodiments, the backfill material is the same as the index-matching material. The second substrate is characterized by a fifth refractive index matching the fourth refractive index.

公开(公告)号：US20230041380A1

公开(公告)日：2023-02-09

申请号：US17874229

申请日：2022-07-26

Applicant: Meta Platforms Technologies, LLC

Inventor： Alejo LIFSCHITZ ARRIBIO ,  Ankit VORA ,  Keren ZHANG ,  Jonathan William ONORATO ,  Vivek GUPTA

IPC: F21V8/00 ,  G02B27/01 ,  C09C1/36 ,  C09C3/06 ,  C09D7/62 ,  C09D7/40 ,  C09D11/037 ,  C09D11/322

Abstract: A nanocomposite includes a plurality of nanoparticles, where each nanoparticle of the plurality of nanoparticles includes a TiO2 nanoparticle core characterized by a diameter between about 1 nm and about 20 nm and a surface .OH density below about 6.OH/nm2, and a nanoparticle shell conformally formed on surfaces of the TiO2 nanoparticle core. The nanoparticle shell is continuous and is thinner than about 2 nm. The nanoparticle shell includes a transparent material with a refractive index greater than about 1.7 for visible light. A valence band of the nanoparticle shell is more than about 0.1 eV lower than a valence band of the TiO2 nanoparticle core. A conduction band of the nanoparticle shell is more than about 0.5 eV higher than a conduction band of the TiO2 nanoparticle core.

公开(公告)号：US20220334289A1

公开(公告)日：2022-10-20

申请号：US17720058

申请日：2022-04-13

Applicant: Meta Platforms Technologies, LLC

Inventor： Keren ZHANG ,  Sara AZARI ,  Austin LANE ,  Feyza DUNDAR ARISOY ,  Ankit VORA ,  Nihar Ranjan MOHANTY ,  Vivek GUPTA

IPC: G02B1/11 ,  G02B27/01 ,  C09D133/08 ,  C08K9/04 ,  B05D1/00

Abstract: An optical device includes a substrate, a first surface-relief grating including grooves and ridges formed on or in the substrate, a first overcoat layer in the grooves of the first surface-relief grating, and a first antireflective layer on the first overcoat layer. The ridges of the first surface-relief grating include high-refractive index, photoactive metal oxide nanoparticles and a material of the first overcoat layer in regions between the metal oxide nanoparticles, or the first overcoat layer includes the metal oxide nanoparticles and a material of the first antireflective layer in regions between the metal oxide nanoparticles. Methods of fabricating the optical device are also described.