Angled Optical Waveguide via Refractive Index Contrast
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Solution Overview
Problem
Conventional integrated optical waveguides face challenges in achieving angled radiation with sufficient efficiency and manufacturability due to material incompatibilities, complex designs, and poor optical coupling, limiting their functionality in advanced applications.
Innovation Solution
An optical waveguide design featuring a substrate, cladding layer, and radiation layer with differing refractive indices, allowing for angled radiation by enlarging the optical mode's spot size through controlled tapering and refractive index differences, enhancing efficiency to over 90% in some cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If grating couplers or diffraction gratings are used to achieve angled radiation, then light can be radiated at desired angles, but manufacturing complexity increases and radiation efficiency decreases
Solution Approach 1:
The patent extracts the angled radiation function from complex grating structures and implements it through a simple wedge-shaped waveguide section. This removes the need for periodic gratings while achieving the same angular radiation effect, thereby reducing manufacturing complexity.
Solution Approach 2:
Instead of using a grating structure to achieve angled radiation, the patent inverts the approach by using a wedge-shaped waveguide that naturally directs light at an angle through its geometry. This inversion simplifies the structure while maintaining the desired angular radiation capability.
2Loss of energy
If multiple etching steps or reflective surfaces are used to improve radiation efficiency, then angular radiation performance improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The waveguide is segmented into distinct sections: a first section for light propagation and a second wedge-shaped section for angled radiation. This segmentation allows each section to be optimized independently, achieving high radiation efficiency without requiring complex multi-step structures.
3Adaptability or versatility
If discrete waveguide and photodetector apparatus are used, then component flexibility is maintained, but assembly difficulty increases and coupling efficiency decreases
Solution Approach 1:
The patent merges the waveguide and photodetector into a single integrated structure where the photodetector is formed as part of the waveguide fabrication process. This eliminates assembly steps while maintaining the flexibility to design custom configurations, and improves coupling efficiency by ensuring optimal optical alignment.
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 design achieves high optical radiation efficiency, simplifies fabrication, and accommodates greater manufacturing tolerances, enabling applications in quantum communication and computation.
Implementation Method 1
The waveguide may be configured to propagate an optical signal... The core is configured with a refractive index higher than that of the surrounding cladding material... The core is configured to propagate the optical signal from the facet towards a distal end of the waveguide
Implementation Method 2
The radiation layer is configured to have a refractive index that is higher than that of the core... a difference in refractive indices between the core and the radiation layer causes the optical mode to radiate at an angle from the core towards the radiation layer
Data Source
AI summary
There is described an optical device and a method of propagating an optical mode within an optical device such that the optical mode radiates at an angle. An optical core encased within a cladding layer extends towards a distal end of the optical device and transmits an optical mode. A radiation layer having a refractive index greater than the optical core is supported above the cladding layer and at least partially vertically overlaps the optical core. The optical core is configured to enlarge a spot size of the optical mode within a portion of the optical core that vertically overlaps the radiation layer, therefore causing the optical mode to radiate within the radiation layer at an angle.