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Optical device

A technology for optical devices and optical waveguides, which is applied in the fields of optics and photonics, and can solve the problems of difficult to manufacture gratings and impossible to achieve by lithography technology.

Pending Publication Date: 2021-10-22
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This geometrical property makes gratings very difficult to fabricate
Since the structure is subwavelength and the required precision is challenging even for e-beam lithography, it is not possible with lithography.

Method used

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Embodiment Construction

[0082] According to the present principles, an optical device comprising at least one diffraction grating will be described. According to an embodiment of the present disclosure, such an optical device may be used, for example, as a waveguide for AR / VR glasses.

[0083] According to the present disclosure, an optical device exhibits a specific diffraction grating that can be used to in-couple light into and / or out-couple light from the optical device.

[0084] According to the present principle, the diffraction grating is configured to diffract incident light in diffraction orders having an absolute value equal to or greater than 2.

[0085] 5.1 Diffraction patterns

[0086] Figure 2 schematically shows what happens to a plane wave (PW) incident on a linear grating (DG). The plane wave is split into diffraction modes (-2, -1, 0, +1, +2), which are angularly spaced beams of local maximum intensity. Although only diffraction pattern numbers -2, -1, 0, 1 and 2 are shown, highe...

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Abstract

An optical device and an eyeware apparatus comprising the optical device are disclosed. The optical device comprises a diffraction grating configured to diffract an incident light of a given wavelength on said optical device, said diffraction grating having a grating pitch above said given wavelength and being configured to diffract said incident light at a diffraction order having an absolute value equal to or greater than 2, wherein the optical device comprises an optical waveguide configured for guiding said light diffracted at a diffraction order having an absolute value equal to or greater than 2. The diffraction grating comprises a substrate of a first dielectric material with refractive index n3 and at least one second dielectric material with refractive index n2 deposited on said substrate, where n3 < n2 or n3 = n2.

Description

1. Technical field [0001] The present disclosure relates to the fields of optics and photonics, and more particularly to optical devices comprising at least one diffraction grating. It can be applied in the field of comfortable and wearable optics, i.e. AR / VR glasses (Augmented Reality / Virtual Reality), as well as various other electronic consumer products including displays and / or lightweight imaging systems. 2. Background technology [0002] This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of the invention, which are described and / or claimed below. It is believed that this discussion helps to provide the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. [0003] AR / VR glasses are considered to be the next-generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B27/00G02B27/01
CPCG02B5/1866G02B27/0081G02B27/0172G02B2027/0112G02B2027/0178G02B2027/0123G02B5/1814
Inventor 瓦尔特·德拉齐克奥克萨那·什拉姆科娃
Owner INTERDIGITAL CE PATENT HLDG