公开(公告)号：US20240192431A1

公开(公告)日：2024-06-13

申请号：US18532594

申请日：2023-12-07

Applicant: Snap Inc.

Inventor： Alexander Drayton ,  Marcell Kiss ,  Parashara Panduranga ,  Jamie Dean Reynolds ,  Cheng Shi

IPC: F21V8/00

CPC classification number: G02B6/005 ,  G02B27/0172

Abstract: In a thin film stack deposited on a substrate, a first layer can have a non-uniform thickness. A second layer, disposed so that the first layer is between the substrate and the second layer, can have a non-uniform thickness. A first pattern can be formed on the second layer to define first areas. The second layer can be etched in the first areas to form first holes having varying depths. A second pattern can be formed on the first layer in the first holes to define second areas. Each second area can be smaller than a corresponding first area. The first layer can be etched in the second areas to form second holes having varying depths. An imprint of the etched thin film stack can be formed such that the first holes and the second holes form a plurality of diffractive elements having varying sizes on the imprint.

公开(公告)号：US20240411069A1

公开(公告)日：2024-12-12

申请号：US18670486

申请日：2024-05-21

Applicant: Snap Inc.

Inventor： Akheelesh Kumar Abeeluck ,  Alexander Drayton ,  Marcell Kiss ,  Parashara Panduranga

IPC: G02B5/18

Abstract: A stepped diffraction grating and method for manufacturer thereof are disclosed. A plurality of parallel grating lines are each formed on a substrate surface by forming a plurality of stacked layers of optically transmissive material. In cross-section, each grating line has an upper layer having an upper surface having a first end and a second end; a bottom layer having a bottom surface abutting the substrate surface and an upper surface having a first end and a second end; a rising staircase portion extending at a rising staircase angle between 10 degrees and 60 degrees; and a falling staircase portion extending at a falling staircase angle between the rising staircase angle and 89 degrees.