Integrated Spectrometer Waveguide Reflection Grating Crosstalk
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Solution Overview
Problem
Conventional microfluidic chip laboratories are bulky, complex to debug, and inconvenient to carry, with issues of light crosstalk in spectrometers due to the propagation of different wavelengths in total reflection mode within optical waveguides.
Innovation Solution
A spectrometer design incorporating a waveguide structure with a light source, collimating mirror, and reflection grating, which separates light of different wavelengths by varying their emergent angles, avoiding crosstalk and enabling miniaturization and portability, while using the waveguide as a carrier for these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional microfluidic chip laboratories are used, then basic operation units can be integrated into a chip, but the system becomes bulky and complex to debug
Solution Approach 1:
The patent merges the light source, collimating mirror, reflection grating, and waveguide structure into a single integrated spectrometer unit. This consolidation reduces the number of separate components and connections, thereby simplifying the overall system structure and making debugging easier while maintaining the integration benefits of microfluidic chip laboratories.
2Volume of moving object
If light propagates in total reflection mode within optical waveguides, then the waveguide structure can be compact, but light crosstalk occurs between different wavelengths
Solution Approach 1:
The patent extracts the wavelength separation function from the total reflection propagation process by introducing a reflection grating. The grating disperses different wavelengths into different spatial paths before they re-enter the waveguide, preventing crosstalk while maintaining the compact waveguide structure. This separates the harmful crosstalk effect from the useful total reflection propagation.
Solution Approach 2:
The patent applies local quality by introducing the reflection grating at a specific location within the waveguide structure. The grating is positioned to selectively interact with light of different wavelengths at different locations, creating wavelength-dependent propagation paths. This localized modification allows compact waveguide operation while preventing crosstalk through spatial separation of wavelengths.
3Object-generated harmful factors
If a reflection grating is introduced to separate wavelengths, then light crosstalk is avoided, but the device structure becomes more complex
Solution Approach 1:
The patent combines the reflection grating with the waveguide structure, integrating the wavelength separation function into the existing optical path. By merging these components rather than adding them as separate external elements, the overall device complexity is minimized while still achieving effective wavelength separation to prevent crosstalk.
4Weight of moving object
If the spectrometer is miniaturized for portability, then it becomes easier to carry, but maintaining stability becomes more difficult
Solution Approach 1:
The patent merges all critical optical components (light source, collimating mirror, reflection grating, waveguide) into a single integrated unit, which improves portability by reducing overall size and weight. The integrated design inherently maintains stability by eliminating alignment issues between separate components and reducing mechanical vibrations that would affect larger, more complex systems.
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 spectrometer achieves spectral splitting at specific positions, avoiding light crosstalk and ensuring stability and portability, with a simplified structure that integrates well with micro-total analysis systems.
Implementation Method 1
the collimating mirror is configured to convert light, which is emitted by the light source, passes through the waveguide structure, and is incident on the collimating mirror, into collimating light
Implementation Method 2
the collimating light propagates in the waveguide structure in a total reflection mode
Implementation Method 3
the reflection grating is configured to allow emergency angles of light of different wavelength ranges among the collimating light incident on the reflection grating to be different, so that the light of different wavelength ranges has an offset in the total reflection propagation process
Data Source
AI summary
A spectrometer and a micro-total analysis system are provided. The spectrometer includes a waveguide structure, a light source, a collimating mirror, a reflection grating, and a light extraction structure. The collimating mirror is configured to convert light, which is emitted from the light source, passes through the waveguide structure, and is incident on the collimating mirror, into collimating light. The reflection grating is configured to allow emergency angles of light of different wavelength ranges among the collimating light incident on the reflection grating to be different, so that the light of different wavelength ranges has an offset in the total reflection propagation process. The light extraction structure is located on the reflection surface of the waveguide structure through which the light of different wavelength ranges passes in the total reflection propagation process, so that the light of different wavelength ranges emits from the light extraction structure.