Plasmonic Junction for Optical Interconnect Alignment Tolerance
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Solution Overview
Problem
Current optical interconnect architectures, such as evanescent coupling, face challenges in achieving excellent alignment tolerances, particularly in the Z-direction, which affects signal coupling efficiency due to material variations and warpage of the package substrate.
Innovation Solution
Incorporating a plasmonic junction with nano-features over the optical waveguide to enhance electromagnetic radiation focusing, thereby improving alignment tolerances in all directions, specifically increasing Z-direction tolerance from less than 1.5 µm to up to 8 µm, and enhancing X and Y-direction tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If evanescent coupling architecture is used, then optical signal coupling is achieved, but alignment tolerance in Z-direction is poor (less than 1.5 µm)
Solution Approach 1:
The patent introduces a plasmonic junction that modifies the electromagnetic field parameters between the laser and waveguide. By creating surface plasmons at the metal-dielectric interface, the field distribution and intensity are fundamentally changed, enabling relaxed alignment tolerances while maintaining coupling efficiency
Solution Approach 2:
The plasmonic junction acts as an intermediary structure between the laser and the optical waveguide. This intermediate layer with specific electromagnetic properties facilitates energy transfer and field confinement, bridging the gap between the two components and improving tolerance to misalignment
2Strength
If package substrate is used, then structural support is provided, but warpage and material variations hinder coupling
Solution Approach 1:
The plasmonic junction creates a localized electromagnetic field enhancement that is relatively insensitive to substrate warpage. By concentrating the field interaction at the junction interface rather than over a large area, the system becomes more tolerant to global substrate deformations
Solution Approach 2:
The invention addresses the two-dimensional alignment problem by introducing a plasmonic field confinement mechanism that operates at the nanoscale interface. This creates an effective 'third dimension' of field control that compensates for misalignments in the X-Y plane and Z-height variations
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 plasmonic junction significantly improves coupling efficiency by amplifying the electromagnetic radiation, allowing for better signal strength and alignment tolerances, thereby increasing device yield and accommodating material warpage and misplacement.
Implementation Method 1
a plasmonic junction between the laser and the optical waveguide
Implementation Method 2
Incorporating a plasmonic junction with nano-features over the optical waveguide to enhance electromagnetic radiation focusing
Data Source
AI summary
Embodiments disclosed herein include optical interconnects and methods of forming such optical interconnects. In an embodiment, the optical interconnect comprises a package substrate, where an optical waveguide is embedded in the package substrate. In an embodiment, a photonics integrated circuit (PIC) is over the package substrate, where the PIC comprises a laser that is configured to be optically coupled to the optical waveguide. In an embodiment, the optical interconnect further comprises a plasmonic junction between the laser and the optical waveguide.