公开(公告)号：US20240361602A1

公开(公告)日：2024-10-31

申请号：US18766282

申请日：2024-07-08

Applicant: Magic Leap, Inc.

Inventor： Kang LUO ,  Vikramjit SINGH ,  Nai-Wen PI ,  Shuqiang YANG ,  Frank Y. XU

IPC: G02B27/01 ,  G02B6/34

CPC classification number: G02B27/0172 ,  G02B6/34 ,  G02B27/0176 ,  G02B2027/0178

Abstract: Blazed diffraction gratings provide optical elements in head-mounted display systems to, e.g., incouple light into or out-couple light out of a waveguide. These blazed diffraction gratings may be configured to have reduced polarization sensitivity. Such gratings may, for example, incouple or outcouple light of different polarizations with similar level of efficiency. The blazed diffraction gratings and waveguides may be formed in a high refractive index substrate such as lithium niobate. In some implementations, the blazed diffraction gratings may include diffractive features having a feature height of 40 nm to 120 nm, for example, 80 nm. The diffractive features may be etched into the high index substrate, e.g., lithium niobate.

公开(公告)号：US20240319506A1

公开(公告)日：2024-09-26

申请号：US18679328

申请日：2024-05-30

Applicant: Magic Leap, Inc.

Inventor： Xiaopei DENG ,  Vikramjit SINGH ,  Shuqiang YANG ,  Kang LUO ,  Nai-Wen PI ,  Frank Y. Xu

IPC: G02B27/01 ,  G02B6/10 ,  G02B6/122 ,  G02B6/13 ,  G02B27/00

CPC classification number: G02B27/0172 ,  G02B6/0011 ,  G02B6/1223 ,  G02B6/13 ,  G02B27/0081 ,  G02B6/10 ,  G02B2027/0174

Abstract: Recesses are formed on a front side and a rear side of a waveguide. A solid porogen material is spun onto the front side and the rear side and fills the recesses. First front and rear cap layers are then formed on raised formations of the waveguide and on the solid porogen material. The entire structure is then heated and the solid porogen material decomposes to a porogen gas. The first front and rear cap layers are porous to allow the porogen gas to escape and air to enter into the recesses. The air maximizes a difference in refractive indices between the high-index transparent material of the waveguide and the air to promote reflection in the waveguide from interfaces between the waveguide and the air.

公开(公告)号：US20230258943A1

公开(公告)日：2023-08-17

申请号：US18308404

申请日：2023-04-27

Applicant: Magic Leap, Inc.

Inventor： Kang LUO ,  Vikramjit SINGH ,  Nai-Wen PI ,  Shuqiang YANG ,  Frank Y. XU

IPC: G02B27/01 ,  G02B6/34

CPC classification number: G02B27/0172 ,  G02B27/0176 ,  G02B6/34 ,  G02B2027/0178

Abstract: Blazed diffraction gratings provide optical elements in head-mounted display systems to, e.g., incouple light into or out-couple light out of a waveguide. These blazed diffraction gratings may be configured to have reduced polarization sensitivity. Such gratings may, for example, incouple or outcouple light of different polarizations with similar level of efficiency. The blazed diffraction gratings and waveguides may be formed in a high refractive index substrate such as lithium niobate. In some implementations, the blazed diffraction gratings may include diffractive features having a feature height of 40 nm to 120 nm, for example, 80 nm. The diffractive features may be etched into the high index substrate, e.g., lithium niobate.

公开(公告)号：US20220075118A1

公开(公告)日：2022-03-10

申请号：US17416248

申请日：2019-12-20

Applicant: Magic Leap, Inc.

Inventor： Xiaopei DENG ,  Vikramjit SINGH ,  Shuqiang YANG ,  Kang LUO ,  Nai-Wen PI ,  Frank Y. XU

IPC: G02B6/13 ,  G02B6/122 ,  G02B27/01

Abstract: Recesses are formed on a front side and a rear side of a waveguide. A solid porogen material is spun onto the front side and the rear side and fills the recesses. First front and rear cap layers are then formed on raised formations of the waveguide and on the solid porogen material. The entire structure is then heated and the solid porogen material decomposes to a porogen gas. The first front and rear cap layers are porous to allow the porogen gas to escape and air to enter into the recesses. The air maximizes a difference in refractive indices between the high-index transparent material of the waveguide and the air to promote reflection in the waveguide from interfaces between the waveguide and the air.