Wafer-Level Micro-Glass-Blowing for Optically Smooth Microspheres
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Solution Overview
Problem
Conventional glass-blowing techniques are not compatible with microfabrication, as they produce large components and cannot achieve spherical shapes or attach glass components to surfaces, limiting their integration with optics and other micro-fabrication components.
Innovation Solution
A method of glass-blowing on a microscopic scale involves bonding a thin glass sheet to a perforated substrate, heating it, and applying pressure to form microspheres, which can be filled post-fabrication, allowing for integration with micro-fabrication components and batch fabrication of micro-glass components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional glass-blowing techniques are used, then large glass components can be produced, but they are not compatible with microfabrication and cannot be integrated with optics and other micro-fabrication components
Solution Approach 1:
The invention divides the glass-blowing process into discrete, controllable steps performed on individual glass sheets that have been segmented into specific locations on a substrate. Each glass sheet is heated and formed independently at its designated position, allowing integration with other microfabricated components on the same substrate while producing micro-scale rather than macro-scale components.
Solution Approach 2:
The invention transitions from traditional three-dimensional manual glass-blowing to a two-dimensional planar process where glass sheets are heated and formed on a flat substrate surface. The glass is blown through holes in the substrate from the rear side, creating micro-spheres or micro-chambers that lie in the plane of the substrate, enabling integration with other planar microfabricated components.
2Volume of moving object
If traditional etching techniques are used to create small confinement chambers, then smaller chambers can be achieved, but the surfaces become rough and sidewalls become very thick making it unfit for applications requiring integrated optics
Solution Approach 1:
The invention changes the fundamental parameters of the glass-forming process by heating the glass to its softening point and then applying pressure while it remains plastic. This allows the glass to flow and form smooth spherical surfaces with controlled wall thickness, in contrast to etching which removes material and creates rough surfaces with thick sidewalls. The glass-blowing process produces optically smooth surfaces suitable for integrated optics.
Solution Approach 2:
The invention utilizes the phase transition of glass from solid to plastic state through heating to its softening point. In this plastic state, the glass becomes formable and can be shaped into smooth spheres with uniform wall thickness. After forming, the glass cools and solidifies, locking in the smooth surface quality. This phase transition approach contrasts with etching which mechanically removes material and cannot achieve similar surface quality.
3Volume of stationary object
If conventional glass-blowing is used to create large components, then large-scale confinement chambers can be created, but the process cannot be used for micro-fabrication compatible components
Solution Approach 1:
The invention merges the glass-blowing process with standard microfabrication techniques by integrating glass heating and forming directly onto a substrate that can also accommodate other microfabricated components. The substrate with etched holes serves as both the template for glass formation and the platform for integrating electronics, optics, and other micro-components, combining previously separate processes into a unified microfabrication-compatible approach.
Solution Approach 2:
The substrate acts as an intermediary element that enables micro-scale glass-blowing. The substrate with precisely etched holes serves as a mold or template that defines the geometry of the glass micro-chambers. This intermediary structure allows control over chamber size at the micro-scale while providing a platform for integration with other microfabricated components, bridging the gap between manual glass-blowing and microfabrication.
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
This approach enables the production of micro-glass-spheres that are micro-fabrication compatible, suitable for various applications such as gas confinement chambers, nuclear magnetic resonance gyroscopes, and biomedical devices, while achieving smaller sizes and smoother surfaces than traditional methods.
Implementation Method 1
Heat the glass to its softening point
Implementation Method 2
heating the glass, and then blowing the glass from the reverse side of the wafer
Implementation Method 3
Fluidic pressure is applied through the holes to the sheet of thermally formable material, while the sheet of glass is still plastic
Data Source
AI summary
A method for forming microspheres on a microscopic level comprises the steps of defining holes through a substrate, disposing a sheet of thermally formable material onto the substrate covering the holes, heating the sheet of thermally formable material until a predetermined degree of plasticity is achieved, applying fluidic pressure through the holes to the sheet of thermally formable material, while the sheet of glass is still plastic, and forming microspheres on the substrate in the sheet of thermally formable material by means of continued application of pressure for a predetermined time. The invention also includes a substrate having a plurality of holes defined therethrough, a layer of thermally formable material disposed onto the substrate covering the plurality of holes, and a plurality of microspheres thermally formed in the layer by means of applied pressure through the holes when it has been heated to a predetermined degree of plasticity.