公开(公告)号：WO2022104277A2

公开(公告)日：2022-05-19

申请号：PCT/US2021/059548

申请日：2021-11-16

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： LANE, Austin ,  ALIM, Marvin Dion ,  YANG, Yang ,  MCNEIL, Janee Ashley

IPC: G02B5/32 ,  G02B27/01 ,  G03H1/02 ,  G03H1/18 ,  G02B27/0172 ,  G02B5/1857 ,  G03H1/0248 ,  G03H1/181 ,  G03H1/182

Abstract: A method for making an optical grating having a non-uniform refractive index profile along a direction substantially perpendicular to a plane defined by the optical grating includes placing a layer of photopolymerization material (302) having a first surface and a second surface that is opposite to the first surface between a first material transfer layer (304) and a second material transfer layer (306) so that the first surface of the layer of photopolymerization material is in contact with the first material transfer layer and the second surface of the layer of photopolymerization material is in contact with the second material transfer layer to allow material transfer between the layer of photopolymerization material and the first and second material transfer layers by diffusion. The material diffused can be a photoinitiator or an unreacted monomer from the photopolymer, or a photoinhibitor or low or high index material from the transfer layer.

公开(公告)号：WO2021108232A1

公开(公告)日：2021-06-03

申请号：PCT/US2020/061396

申请日：2020-11-19

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： PURVIS, Lafe ,  LANE, Austin ,  COLBURN, Matthew E.

IPC: C07C271/48 ,  C07C323/18 ,  G03H1/02

Abstract: The disclosure provides recording materials including anthraquinone derivatized monomers and polymers for use in volume Bragg gratings, including, but not limited to, volume Bragg gratings for holography applications. Several structures are disclosed for anthraquinone derivatized monomers and polymers for use in Bragg gratings applications, leading to materials with higher refractive index, low birefringence, and high transparency. The disclosed anthraquinone derivatized monomers and polymers thereof can be used in any volume Bragg gratings materials, including two-stage polymer materials where a matrix is cured in a first step, and then the volume Bragg grating is written by way of a second curing step of a monomer.

公开(公告)号：WO2021108191A1

公开(公告)日：2021-06-03

申请号：PCT/US2020/061120

申请日：2020-11-18

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： PURVIS, Lafe ,  LANE, Austin ,  COLBURN, Matthew E.

IPC: C07C235/34 ,  C07C271/48 ,  C07D407/10 ,  G03H1/02

Abstract: The disclosure provides recording materials including aromatic substituted alkane-core derivatized monomers and polymers for use in volume Bragg gratings, including, but not limited to, volume Bragg gratings for holography applications. Several structures are disclosed, including Formula I. When used in Bragg gratings applications, the monomers and polymers disclosed lead to materials with higher refractive index, low birefringence, and high transparency. The disclosed derivatized monomers and polymers can be used in any volume Bragg gratings materials, including two-stage polymer materials where a matrix is cured in a first step, and then the volume Bragg grating is written by way of a second curing step of a monomer.

公开(公告)号：WO2022104137A1

公开(公告)日：2022-05-19

申请号：PCT/US2021/059241

申请日：2021-11-12

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： LANE, Austin ,  COLBURN, Matthew E. ,  PURVIS II, Lafe Joseph

IPC: C07C233/65 ,  C07C271/16 ,  C07C323/12 ,  C07C323/20 ,  C07F9/18 ,  C08J3/00 ,  G03H1/02

Abstract: The disclosure provides recording materials including propane derivatized monomers and polymers for use in volume Bragg gratings, including, but not limited to, volume Bragg gratings for holography applications. Several structures are disclosed for propane derivatized monomers and polymers for use in Bragg gratings applications, leading to materials with higher refractive index, low birefringence, and high transparency. The disclosed propane derivatized monomers and polymers thereof can be used in any volume Bragg gratings materials, including two-stage polymer materials where a matrix is cured in a first step, and then the volume Bragg grating is written by way of a second curing step of a monomer.

公开(公告)号：WO2022060485A1

公开(公告)日：2022-03-24

申请号：PCT/US2021/045043

申请日：2021-08-06

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： FRANKE, Elliott ,  MOHANTY, Nihar Ranjan ,  LANE, Austin ,  COLBURN, Matthew E. ,  VORA, Ankit

IPC: G02B5/18 ,  G02B27/01

Abstract: A method of fabricating gratings with variable grating depths including depositing a first grating material layer with a uniform thickness profile on a substrate, forming an etch mask layer having a variable thickness profile on the first grating material layer, etching the etch mask layer and the first grating material layer to change the uniform thickness profile of the first grating material layer to a non-uniform thickness profile, forming a patterned hard mask on the first grating material layer, and etching, using the patterned hard mask, the first grating material layer to form a grating with a variable depth in the first grating material layer.

公开(公告)号：WO2021108597A1

公开(公告)日：2021-06-03

申请号：PCT/US2020/062284

申请日：2020-11-25

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： LANE, Austin ,  COLBURN, Matthew E. ,  PURVIS, Lafe

IPC: C07F9/18 ,  G03H1/02

Abstract: The disclosure provides recording materials including thiophosphate derivatized monomers and polymers for use in volume Bragg gratings, including, but not limited to, volume Bragg gratings for holography applications. Several structures are disclosed for thiophosphate derivatized monomers and polymers for use in Bragg gratings applications, leading to materials with higher refractive index, low birefringence, and high transparency. The disclosed thiophosphate derivatized monomers and polymers thereof can be used in any volume Bragg gratings materials, including two-stage polymer materials where a matrix is cured in a first step, and then the volume Bragg grating is written by way of a second curing step of a monomer.

公开(公告)号：WO2021040825A1

公开(公告)日：2021-03-04

申请号：PCT/US2020/032807

申请日：2020-05-14

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： LEIBOVICI, Matthieu, Charles, Raoul ,  LANE, Austin ,  CHI, Wanli ,  LEE, Hee, Yoon

IPC: G03H1/00 ,  G03H1/02

Abstract: Techniques disclosed herein relate to modifying refractive index modulation in a holographic optical element, such as a holographic grating. According to certain embodiments, a holographic optical element or apodized grating includes a polymer layer comprising a first region characterized by a first refractive index and a second region characterized by a second refractive index. The holographic optical element or apodized grating includes a plurality of nanoparticles dispersed in the polymer layer. The nanoparticles have a higher concentration in either the first region or the second region. In some embodiments, the nanoparticles may be configured to increase the refractive index modulation. In some embodiments, the nanoparticles may be configured to apodize the grating by decreasing the refractive index modulation proximate to sides of the grating. The refractive index may be modulated by applying a monomer reservoir buffer layer to the polymer layer, either before or after hologram fabrication.

公开(公告)号：WO2020101701A1

公开(公告)日：2020-05-22

申请号：PCT/US2018/061507

申请日：2018-11-16

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： CHI, Wanli ,  LEIBOVICI, Matthieu Charles Raoul ,  LANE, Austin ,  JORABCHI, Kavous

IPC: G02B5/18 ,  G02B27/00 ,  G02B27/42 ,  G02B27/01

Abstract: A waveguide, e.g. an image-replicating waveguide, is provided. The waveguide includes a substrate having two outer surfaces, for propagating a beam of image light in the substrate by reflecting the beam from the outer surfaces. A diffraction grating is supported by the substrate and configured for diffracting the impinging beam. A partial reflector is disposed in the substrate between and parallel to the first and second surfaces. The partial reflector is configured for splitting the impinging beam, increasing the number of beam portions in the waveguide, thereby improving output pupil density.

公开(公告)号：WO2020112160A1

公开(公告)日：2020-06-04

申请号：PCT/US2019/029017

申请日：2019-04-24

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： LINDSAY, Jack ,  SMYTH, Katherine Marie ,  WALLIN, Thomas John Farrell ,  OUDERKIRK, Andrew John ,  MALHOTRA, Tanya ,  LANE, Austin ,  LIAO, Christopher Yuan Ting ,  MENGUC, Yigit

IPC: H01L41/45 ,  H01L41/193

Abstract: A device may include a primary electrode, a secondary electrode overlapping at least a portion of the primary electrode, and an electroactive polymer element disposed between and abutting the primary electrode and the secondary electrode. The electroactive polymer element may include a nanovoided polymer material whereby resistance to deformation of the electroactive polymer element is non-linear with respect to an amount of deformation of the electroactive polymer element. Various other devices, method, and systems are also disclosed.

公开(公告)号：WO2020106660A2

公开(公告)日：2020-05-28

申请号：PCT/US2019/062098

申请日：2019-11-19

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： MENGUC, Yigit ,  OUDERKIRK, Andrew, John ,  LIAO, Christopher Yuan, Ting ,  SMYTH, Katherine, Marie ,  WALLIN, Thomas ,  LINDSAY, Jack ,  LANE, Austin ,  MALHOTRA, Tanya ,  DEIST, Ken

IPC: G06F3/01 ,  H04L12/24

Abstract: In some embodiments, an electroactive device includes a first electrode, a second electrode, and an electroactive element disposed between the first electrode and the second electrode. The electroactive element may include a plurality of voids distributed within the electroactive element. The electroactive device may have a non-uniform electroactive response based at least in part on a non-uniform distribution of voids within the electroactive element. The non-uniform electroactive response may include a non-uniform sensor response or a non-uniform actuation response. Various other methods, systems, apparatuses, and materials are also disclosed.