Optical Reflectors with 3D Waveguide Segments for Void-Free Filling
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Solution Overview
Problem
The inability to reliably fabricate small gaps and slots in Bragg gratings and Bragg reflectors filled by void-free dielectric material hinders the realization of high-performance optical components, leading to significant performance variability.
Innovation Solution
A structure for optical reflectors and Echelle gratings is designed with waveguide cores having tapered sections and segments separated by gaps, where the segments are positioned in different levels to allow relaxed spacing, enabling void-free filling by dielectric material, and incorporating Bragg reflectors with overlapping relationships to enhance light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small gaps and slots are fabricated in Bragg gratings and Bragg reflectors, then the optical component performance can be improved, but the fabrication reliability deteriorates and void-free dielectric filling becomes difficult
Solution Approach 1:
The patent transitions from planar 2D Bragg grating structures to 3D vertically-stacked waveguide core structures. By positioning multiple waveguide cores at different vertical levels with overlapping horizontal projections, the design enables larger effective gaps that can be reliably fabricated and filled with dielectric material without voids, while maintaining optical functionality through the vertical stacking configuration.
2Area of stationary object
If segments are positioned close together to achieve compact design, then the device area is reduced, but the ability to fill gaps with void-free dielectric material deteriorates
Solution Approach 1:
The patent uses vertical stacking to achieve compact lateral footprint while maintaining adequate gap sizes for reliable dielectric filling. Multiple waveguide core segments are positioned at different vertical levels (z-dimension) with overlapping horizontal projections, creating effective gaps that are accessible and fillable with dielectric material without voids, thus achieving both compact area and high manufacturing precision.
Solution Approach 2:
The patent implements nested positioning where waveguide core segments at different vertical levels are horizontally offset and overlap in projection. This nesting arrangement allows the structure to maintain a compact lateral footprint while creating accessible gaps between segments that can be reliably filled with dielectric material, solving the contradiction between compact area and filling quality.
3Adaptability or versatility
If complex segmented structures are fabricated to enhance optical functionality, then the optical performance can be improved, but the fabrication variability increases
Solution Approach 1:
The patent achieves enhanced optical functionality through vertical stacking of waveguide core segments at different levels with controlled overlapping projections, rather than relying on complex planar patterns. This 3D configuration provides design flexibility for optical functionality while using larger, more reliable gap dimensions that reduce fabrication variability and improve performance consistency across manufactured devices.
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
The solution improves performance consistency and reduces variability in optical components by ensuring void-free dielectric filling, thereby enhancing the functionality of optical reflectors and Echelle gratings.
Implementation Method 1
Bragg gratings and Bragg reflectors are basic building-block elements included in many optical components
Implementation Method 2
The first waveguide core includes a tapered section and a plurality of segments separated by a plurality of gaps
Data Source
AI summary
Structures for an optical component, such as an optical reflector or an Echelle grating, and methods of forming such structures. The structure comprises a first waveguide core positioned in a vertical direction over a semiconductor substrate. The first waveguide core includes a tapered section and a plurality of segments separated by a plurality of gaps. A second waveguide core, which is positioned in the vertical direction relative to the first waveguide core, includes a portion positioned adjacent to the first waveguide core.