Layered Microdisk Laser Particles for High-Yield Spectral Multiplexing
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Solution Overview
Problem
Current laser particle technologies face limitations in scalability and cost-effectiveness for simultaneous tagging and tracking of large numbers of cells due to the two-dimensional fabrication process, which restricts the production of microdisk lasers to ~107 per cm2 of wafer, and the use of expensive III-V semiconductors.
Innovation Solution
Employ layered fabrication techniques to produce singlet and multiplet laser particles (mLPs) from different epitaxial layers, allowing for increased production and unique optical emission properties, with methods involving etching and selective release of laser particles into suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two-dimensional fabrication process is used for microdisk lasers, then manufacturing simplicity is maintained, but productivity is limited to ~10^7 particles per cm² of wafer
Solution Approach 1:
The patent transitions from two-dimensional fabrication to three-dimensional layered fabrication by stacking multiple epitaxial layers vertically. Each layer contains microdisk lasers that can be selectively released, enabling production of thousands to millions of particles from a single wafer without proportionally increasing wafer area or process complexity
Solution Approach 2:
The fabrication process segments the wafer into multiple functional epitaxial layers, each containing microdisk lasers with distinct spectral peaks. This segmentation allows independent processing and selective release of particles from different layers, dramatically increasing total particle yield while maintaining manageable process complexity
2Productivity
If larger wafers are used to increase production quantity, then productivity improves, but fabrication cost increases
Solution Approach 1:
Instead of increasing wafer area horizontally to produce more particles, the patent utilizes the vertical dimension by stacking multiple epitaxial layers. This approach increases particle yield from a single wafer without requiring larger or more expensive wafer substrates, thereby improving productivity while controlling fabrication costs
3Adaptability or versatility
If multiple laser particles are used for simultaneous tagging, then multiplexing capability is enhanced, but spectral overlap and distinguishability become problematic
Solution Approach 1:
The patent assigns distinct spectral properties to microdisk lasers in different epitaxial layers through localized material composition variations. Each layer is engineered with specific quantum well structures that emit at unique wavelengths, ensuring that simultaneously tagged particles have well-separated, non-overlapping spectra for precise optical distinguishability
Solution Approach 2:
The patent employs composite semiconductor materials with varying bandgap energies across different epitaxial layers. By combining materials such as InGaAsP with different indium compositions, the system creates multiple particle types with distinct emission spectra, enabling high-capacity multiplexing while maintaining clear spectral separation for accurate detection
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
Enables the production of thousands to millions of uniquely identifiable laser particles with distinct spectral peaks, enhancing multiplexing capabilities and reducing fabrication costs by utilizing multiple active layers without the need for larger wafers.
Implementation Method 1
Optical resonance offers effective approaches to generate narrow emission lines. By placing fluorophores and semiconductor materials inside an optical cavity, an extremely narrow spectral line can be produced.
Implementation Method 2
A laser is a great example. By placing fluorophores and semiconductor materials inside an optical cavity, an extremely narrow spectral line can be produced.
Data Source
AI summary
A first layer, a first spacer layer, and a second layer of a semiconductor wafer can be etched to produce a plurality of columnar structures extending from the substrate layer and including a first optical cavity situated about the first gain medium, a second optical cavity situated about the second gain medium, and a first spacer region contacting the first gain medium and the second gain medium. Also, a photonic microparticle formed from a layered semiconductor wafer and of a columnar structure having a first optical cavity situated about a first gain medium, a second optical cavity situated about a second gain medium, and a first spacer region contacting the first gain medium and the second gain medium. The first optical cavity and the second optical cavity in the photonic microparticle are each capable of generating laser light with a distinct spectral peak when energetically excited.