Transfer-Printed Micro-Optical Components for Compact Photonic Systems
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Solution Overview
Problem
The development of miniaturized photonic systems faces challenges due to the limitations of conventional optical elements, which are often too large for compact applications, and the high cost and limited availability of photolithographic processing equipment for compound semiconductor materials compared to silicon.
Innovation Solution
The development of micro-optical components and systems that include light emitters, detectors, and modifiers, such as lasers and photodiodes, integrated with silicon circuits, using micro-substrates and micro-optical elements that are passive or actively light-responsive, allowing for precise assembly and integration in photonic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional optical elements are used in photonic systems, then optical functions (reflection, refraction, diffraction) can be achieved, but the system size becomes too large for miniaturized applications
Solution Approach 1:
The patent segments the optical system into discrete micro-optical components (micro-lenses, micro-mirrors, micro-prisms) that can be independently fabricated on separate wafers and then transferred to a photonic integrated circuit. This segmentation enables miniaturization while preserving optical functionality, as each micro-optical element is optimized for its specific function rather than requiring a large conventional optical assembly.
Solution Approach 2:
The patent implements nesting by integrating micro-optical elements directly onto the photonic integrated circuit substrate, embedding optical functionality within the electronic circuit architecture. This nested integration allows optical components to occupy the same physical space as electronic components, dramatically reducing overall system volume while maintaining full optical functionality.
2Manufacturing precision
If photolithographic processing equipment is used for compound semiconductor materials, then high-resolution devices can be manufactured, but the cost and equipment availability are significantly higher compared to silicon processing
Solution Approach 1:
The patent segments the manufacturing process into separate fabrication stages for different materials (silicon photonic circuits on one wafer, compound semiconductor devices on another wafer, micro-optical elements on a third wafer). This allows each material to be processed using its optimal fabrication techniques and equipment, with silicon circuits manufactured on standard, cost-effective silicon processing lines while compound semiconductor devices are fabricated separately where specialized equipment is required, thereby reducing overall manufacturing costs.
Solution Approach 2:
The patent introduces a transfer printing process as an intermediary step that bridges the gap between separately fabricated components on different wafers. This transfer mechanism allows high-resolution compound semiconductor devices and micro-optical elements to be precisely positioned and integrated with silicon photonic circuits without requiring expensive compound semiconductor processing equipment for the entire system, thus reducing manufacturing costs while maintaining high device resolution.
3Reliability
If compound semiconductor materials (InP, GaAs, GaN) are used for photonic devices, then superior light emission and sensor sensitivity are achieved, but the manufacturing cost and device size increase compared to silicon
Solution Approach 1:
The patent segments the photonic system into distinct functional modules: silicon-based photonic circuits for light guidance, compound semiconductor devices (lasers, photodetectors) for light generation and detection, and micro-optical elements for light manipulation. Each segment is fabricated on its own wafer using material-optimized processes, then transferred and integrated. This segmentation allows the system to achieve superior light emission and sensor sensitivity from compound semiconductors while keeping individual device sizes small through precise micro-fabrication and selective material usage.
Data Source
AI summary
An exemplary micro-optical component includes a micro-substrate and a micro-optical element disposed on the micro-substrate. The micro-optical element is structured to modify or process light. At least a portion of a component tether is physically attached to the micro-substrate or physically attached to the micro-optical element. The micro-optical component has a thickness less than 250 μm. Light can be processed by reflection, refraction, diffraction, frequency changes, polarization changes, color-temperature or frequency distribution changes, or phase changes. The micro-optical component can be disposed on a system substrate to form a micro-optical system. The system substrate can include a cavity and the micro-optical element can be disposed at least partially in the cavity. Micro-optical components can be passive optical micro-devices. A light-active element can be disposed on the micro-substrate to receive light from or emit light to the micro-optical element.