Integrated Glass Micro-Optics for Alignment-Free Fiber Coupling

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Solution Overview

Problem

The challenge in manufacturing miniaturized distal-end optical systems for spectroscopy in hard-to-reach body areas is the complexity and cost of current fabrication techniques, which are labor-intensive and unsuitable for commercial production due to the need for intricate manual alignment of micro-components.

Innovation Solution

A method involving direct laser writing and chemical etching of dielectric substrates to create optical devices with controlled etch rates, using Type II nanogratings for enhanced etch-rate selectivity and surface topography, along with flame polishing for surface smoothing, to produce reliable and cost-effective miniaturized optical components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual alignment of micro-components is used, then optical device performance can be achieved, but manufacturing complexity and cost increase significantly

Engineering Contradiction:

Improveoptical device performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple discrete micro-components (lenses, waveguides, gratings) into a single integrated optical device fabricated from one piece of glass using ultrafast laser inscription. This eliminates the need for manual alignment of separate components while maintaining optical performance, directly resolving the contradiction between reliability and manufacturing complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ultrafast laser inscription process serves multiple functions simultaneously: it creates waveguides, focuses light, generates gratings, and forms structural features all in a single fabrication step. This multi-functionality replaces the need for multiple separate manufacturing steps and component assemblies, reducing manufacturing complexity while maintaining device performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If manual alignment of micro-components is used, then optical device performance can be achieved, but production time and cost increase

Engineering Contradiction:

Improveoptical device performanceVSAvoidproduction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs preliminary structuring of all optical features directly within the glass substrate before final device assembly. By pre-forming waveguides, lenses, and gratings during the laser inscription process, the device requires no subsequent manual alignment or assembly steps, thereby dramatically improving production efficiency while maintaining optical performance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the mechanical alignment process with a direct writing laser fabrication process. Instead of mechanically assembling and aligning separate components, the optical structures are directly inscribed into the glass with precise spatial control, eliminating the time-consuming manual alignment step and significantly boosting productivity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This approach enables the reliable and cost-effective fabrication of miniaturized optical devices with improved etch-rate selectivity and surface quality, facilitating the production of custom optics suitable for commercial applications, such as distal-end optical systems for spectroscopy.

Implementation Method 1

ULI relies on focused ultrashort pulses of sub-bandgap light to drive nonlinear multi-photon absorption within a dielectric material, resulting in a permanent change to the material's local structure

Methodology Applied

Scientific EffectMulti-photon absorption: Absorption (EM radiation)

Implementation Method 2

The practice of using ULI in conjunction with chemical etching has gained great traction recently and enabled the fabrication of micro-optic, microfluidic and micromechanical devices

Methodology Applied

Scientific EffectChemical etching: Ablation

Data Source

PatentUS11275215B2Direct laser writing and chemical etching and optical devices

Publication Date: 2022.03.15 HERIOT WATT UNIV

AI summary

An optical device includes a unitary substrate of optically transparent material. The unitary substrate has formed therein at least one collection lens and channel, the channel for receiving an optical fibre and arranged to align the optical fibre inserted therein such that the collection lens couples light collected by the collection lens into the optical fibre.