Metasurface Optical Coupling for Fiber-to-Edge Mode Matching
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Solution Overview
Problem
Existing optical devices face challenges in efficiently transitioning optical signals from optical fibers to photonic integrated circuits due to the limitations of traditional lenses, which are bulky and require significant working distances, hindering compact integration and efficient signal processing.
Innovation Solution
The integration of a metasurface with meta-atoms dispersed in a holding medium, positioned between an optical fiber and an edge coupler, which replaces traditional lenses to facilitate efficient optical signal transition by minimizing chromatic and spherical aberrations, allowing for compact size and achromatic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional lenses are used to transition optical signals from optical fibers to photonic integrated circuits, then optical signal transmission is achieved, but the device size increases and working distance requirements increase
Solution Approach 1:
The patent transforms the optical coupling interface by changing the physical parameters of the lens system. Specifically, it replaces traditional bulky lenses with a planar metasurface structure that has fundamentally different optical parameters - achieving the same mode-matching function with near-zero thickness and no working distance requirement, thus resolving the contradiction between transmission efficiency and device size
Solution Approach 2:
The invention transitions from three-dimensional lens structures to a two-dimensional planar metasurface. This dimensional reduction eliminates the need for vertical working distance while maintaining optical functionality, effectively resolving the space consumption issue while preserving signal transmission efficiency
2Reliability
If traditional lenses are used for optical signal transition, then optical coupling is achieved, but chromatic and spherical aberrations occur
Solution Approach 1:
The metasurface employs locally varying geometric structures (meta-atoms) with different shapes, sizes, and orientations at different spatial positions. Each local region is optimized to provide the specific phase modulation required for mode-matching, enabling aberration-free optical coupling across the entire aperture without the spherical and chromatic aberrations inherent in traditional lenses
Solution Approach 2:
The patent uses composite meta-atom structures composed of multiple materials with different refractive indices arranged in specific geometries. This composite approach enables precise control over the phase profile of transmitted light, achieving achromatic mode-matching that eliminates chromatic aberration while maintaining coupling efficiency
3Ease of operation
If traditional lenses are used, then optical signal transmission is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and eliminates the complex curved surface geometry and multiple lens elements from the optical system. By replacing the entire lens assembly with a single planar metasurface layer, it simplifies the device structure dramatically while maintaining the essential optical signal transmission function through phase modulation at the meta-atom level
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 metasurface enables efficient optical signal transfer with reduced size and complexity, achieving arbitrary mode-matching requirements while maintaining high performance, thus enhancing the integration of optical and electronic components in optical devices.
Implementation Method 1
minimizing chromatic and spherical aberrations
Implementation Method 2
minimizing chromatic and spherical aberrations
Implementation Method 3
achieving arbitrary mode-matching requirements
Data Source
AI summary
Optical devices and methods of manufacture are presented in which a metasurface is utilized to assist optical signals as the optical signals transit between an external device such as an optical fiber and an edge coupler located within a first optical package. The metasurface includes meta-atoms which may be used to help lead the optical signals to the edge coupler.