Tapered Waveguide Profilometry for Uniform Microfluidic Illumination
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Solution Overview
Problem
Conventional methods for creating collimated light in microfluidic devices are inadequate for achieving highly resolved temporal and spatial data from flowing microparticles, and they often require cumbersome optics or spatial light modulators with limited adaptability and high fabrication complexity.
Innovation Solution
A spatio-temporal profilometer that uses a tapered optical collimator waveguide to internally reflect diverging light, producing a collimated and uniform light beam without additional optical elements, enabling efficient light-fluid interaction for high-resolution spatial and temporal data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optics or spatial light modulators are used to create collimated light, then collimated light can be produced, but the device complexity and fabrication complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the need for separate collimating lenses and spatial light modulators by integrating the collimation function directly into the waveguide structure through tapered sidewalls. This removes unnecessary optical elements while maintaining the collimated light production capability.
Solution Approach 2:
The patent merges the functions of light guidance and collimation into a single waveguide structure. The tapered sidewalls of the waveguide simultaneously guide the light and collimate it, eliminating the need for separate optical components and reducing overall device complexity.
2Illumination intensity
If conventional optics are used for light collimation, then collimated light can be achieved, but the adaptability is limited
Solution Approach 1:
The patent introduces dynamic controllability by enabling electronic control over the light emission characteristics from the waveguide. This allows the system to adapt to different measurement requirements and conditions, significantly enhancing versatility compared to fixed conventional optics.
Solution Approach 2:
The waveguide structure serves multiple functions: it guides light, collimates light, and provides a platform for adaptable light emission control. This multi-functionality makes the system universally applicable to various optofluidic measurements without requiring separate specialized components.
3Illumination intensity
If additional optical elements are used to create uniform light profiles, then light uniformity can be improved, but the fabrication complexity increases
Solution Approach 1:
The patent replaces mechanical optical elements (lenses, mirrors, spatial light modulators) with a geometrically engineered waveguide structure. The uniform light profile is achieved through the precise geometric design of tapered sidewalls rather than through additional optical components, significantly simplifying fabrication.
Solution Approach 2:
The patent achieves light profile uniformity by changing the geometric parameters of the waveguide structure itself. By adjusting the taper angle and sidewall geometry, the light emission characteristics are controlled to produce uniform profiles without requiring additional optical elements or complex assembly.
4Measurement precision
If conventional light sources are used in microfluidic devices, then light can be provided, but highly resolved temporal and spatial data cannot be achieved
Solution Approach 1:
The tapered waveguide acts as an intermediary between the light source and the fluid sample. It transforms divergent light into a collimated beam with uniform profile, enabling high-resolution spatial and temporal measurements of flowing particles that cannot be achieved with conventional direct illumination.
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 spatio-temporal profilometer provides highly resolved temporal and spatial data for flowing microparticles with a uniform light profile, enhancing measurement capabilities in optofluidic applications such as cytometry and imaging.
Implementation Method 1
internally reflects the diverging light by internal reflections on collimating sidewalls of tapered optical collimator waveguide
Data Source
AI summary
A spatio-temporal profilometer performs time-resolved spatial profilometry and includes a substrate, a tapered optical collimator waveguide, a fluid channel, and a light-fluid interaction volume. The tapered optical collimator waveguide receives diverging light, internally reflects it, and collimates it. The fluid channel receives a fluid comprising microparticles and communicates the microparticles into the fluid channel. The light-fluid interaction volume is disposed in the fluid channel and provided by an overlap within the fluid channel of the collimated light from the tapered optical collimator waveguide and the fluid. The spatio-temporal profilometer produces product light from the collimated light in response to the microparticles interacting with the collimated light in the light-fluid interaction volume from which is determined a spatial and temporal profile of microparticles in the fluid channel.