Nano-channel Optical Waveguide for Low-Loss Fluid Analysis
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Solution Overview
Problem
Current optical waveguides face challenges in achieving low loss and long interaction lengths for fluids with low molar extinction coefficients, are prone to radiation losses due to curvature, and have difficulties in manufacturing long lengths without damaging the core layer.
Innovation Solution
A nano-channel optical waveguide design featuring two substrates with optical guiding structures facing each other, a channel between them, and laterally attached tanks to minimize radiation losses and facilitate fluid circulation, allowing for long lengths with reduced footprint and improved fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical waveguide is made longer to increase interaction length, then sensitivity is improved, but radiation losses increase due to curvature
Solution Approach 1:
The optical waveguide is divided into multiple straight sections separated by bends, with each section having optimized dimensions to minimize radiation losses while maintaining overall length for sufficient interaction
Solution Approach 2:
The waveguide transitions from a simple linear configuration to a multi-dimensional folded structure, increasing the interaction length in the fluid direction while keeping the footprint compact and reducing curvature-induced losses through optimized bending geometry
2Length of stationary object
If the waveguide length is increased to several tens of centimeters or meters, then interaction length is improved, but manufacturing difficulty increases due to damage risk to core layer
Solution Approach 1:
The long waveguide is segmented into multiple sections that can be manufactured separately and then assembled, reducing the risk of damage to the core layer during manufacturing while achieving the required overall length
Solution Approach 2:
Different sections of the waveguide have locally optimized dimensions and properties to minimize radiation losses and prevent fluid blockage, with the core layer protected from damage through careful design of each section
3Adaptability or versatility
If the slot is emptied to allow fluid introduction, then fluid analysis capability is improved, but manufacturing complexity increases due to difficulty in eliminating material without damaging core layer
Solution Approach 1:
The waveguide structure is segmented to create discrete channels between the core layer and the fluid interface, allowing fluid introduction without requiring complete material removal, thus simplifying manufacturing while maintaining fluid analysis capability
Solution Approach 2:
An intermediary structure is introduced between the core layer and the fluid to enable fluid interaction with the optical mode while protecting the core layer from direct contact and damage during manufacturing
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 design achieves lower radiation losses, enables longer interaction lengths, and prevents fluid blockage or damage, enhancing sensitivity and operational stability for fluid analysis.
Implementation Method 1
The optical waveguide comprises a base substrate (1) surmounted by a core (2) which takes the form of two parallel rails (2.1, 2.2)
Implementation Method 2
Absorption spectrometry is based on the ability of chemical species to absorb light at certain wavelengths. It is described by the Beer-Lambert law which is expressed by P=P0 exp(-αL)
Data Source
Figure 1~2C
Figure 3A~3D
Figure 4~5C
AI summary
It is a question of an optical waveguide comprising a first substrate (10) incorporating a first optical guiding structure (12) exposed on the surface (11) of the first substrate (10), and a second substrate (20) incorporating a second optical guiding structure (22) exposed on the surface (21) of the second substrate (20), these two substrates (10, 20) being assembled superposed via their surfaces (11, 21) so that the two optical guiding structures (12, 22) are arranged opposite each other and extend in the same direction, a channel (30) being provided between the first and second guiding structure (12, 22), this channel (30) being directed along said direction and having a cross section a large dimension of which is substantially parallel to the surface (11) of the first substrate (10) and to the surface (22) of the second substrate (20), allowing light to interact over a given distance with the fluid. Application especially to the analysis of fluids.