Optical Grating Fabrication With Neutralized Ion Beam Etching

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Solution Overview

Problem

Existing methods for producing optical gratings in optical substrates face challenges with charging effects and damage to sensitive structures during ion beam etching, particularly when dealing with insulating materials.

Innovation Solution

Utilizing neutralized ion beam etching to neutralize the ion beam charge, minimizing charging effects and improving control and selectivity, thereby producing blazed and other optical gratings with high precision and accuracy on optical substrates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If ion beam etching is used to produce optical gratings, then manufacturing precision is improved, but charging effects and damage to sensitive structures occur

Engineering Contradiction:

Improvegrating production precisionVSAvoidcharging effects and damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

A conductive layer is introduced as an intermediary between the ion beam and the insulating optical substrate. This conductive layer serves as a mediator that allows ion beam etching to proceed while preventing charge accumulation, thus enabling precise grating production without the harmful charging effects that would otherwise occur on insulating materials

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical conductivity parameter of the substrate surface is changed by depositing a conductive layer. This parameter change transforms the surface from insulating to conductive, allowing the ion beam etching process to operate effectively without generating harmful charging effects, while still enabling high-precision grating fabrication

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Neutralized ion beam etching reduces damage and distortion, enabling precise production of optical gratings such as blazed, reflective, and diffractive gratings for use in waveguides and other optical devices.

Implementation Method 1

neutralized ion beam etching

Methodology Applied

Scientific EffectIon beam etching: Ion Beam

Implementation Method 2

applying a conductive layer to the substrate

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Data Source

PatentUS20250314810A1Producing gratings in optical substrates using neutralized ion beam etching

Publication Date: 2025.10.09 GOOGLE LLC

AI summary

Various techniques for producing gratings in optical substrates include using neutralized ion beam etching. The gratings are used in waveguides or other optical devices. By utilizing neutralized ion beam etching, blazed and other optical gratings can be produced on an optical substrate with high precision and accuracy. The various gratings disclosed herein are utilized as reflective or refractive gratings, a portion of an incoupler, outcoupler, or exit pupil expander in an optical waveguide or lightguide, an echelette grating, or as part of a spectral filtering or spectroscopic system, among others.