Waveguide-Slab Light Coupling for Compact Structured Microscopy
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Solution Overview
Problem
Existing fluorescence microscopy techniques face limitations in resolution due to the diffraction limit and require bulky, expensive optical setups, especially in super-resolution techniques, which are not suitable for smaller laboratories or hospital settings.
Innovation Solution
A light distribution device comprising waveguides and a slab layer that generates a structured illumination pattern with a compact footprint, allowing for high-resolution imaging by controlling interference patterns through phase, wavelength, amplitude, and polarization of light, and utilizing an evanescent field for vertical resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If super-resolution techniques are used to improve resolution beyond the diffraction limit, then imaging detail is improved, but the optical setup becomes bulky and expensive
Solution Approach 1:
The patent replaces complex mechanical optical systems with a photonic integrated circuit that uses waveguides and interferometric patterns to achieve super-resolution. The mechanical/optical components are substituted with planar photonic structures that can be manufactured using standard semiconductor fabrication processes, eliminating the need for bulky optical tables and alignment mechanisms.
Solution Approach 2:
The patent transitions from three-dimensional optical path manipulation to two-dimensional planar integration by embedding waveguides and interference patterns directly in a photonic chip layer. This dimensional reduction allows the entire super-resolution system to be flattened into a compact planar structure that can be integrated with standard microscopy setups.
2Measurement precision
If structured illumination is used to achieve high resolution, then imaging precision is improved, but the footprint of the photonic chip increases
Solution Approach 1:
The patent merges the structured illumination patterns and waveguide structures into a single integrated photonic chip layer. By combining multiple functional elements (waveguides, interference patterns, beam expanders) into one planar structure, the system achieves high-resolution structured illumination without requiring separate components that would increase the overall footprint.
Solution Approach 2:
The photonic chip is designed to perform multiple functions within a single integrated structure: generating structured illumination patterns, expanding light beams, and providing phase control. This multi-functionality eliminates the need for separate dedicated components for each function, thereby reducing the total chip footprint while maintaining imaging precision.
3Measurement precision
If evanescent field excitation is used to achieve high vertical resolution, then depth resolution is improved, but light coupling efficiency decreases
Solution Approach 1:
The patent introduces an intermediary coupling mechanism that bridges the waveguide and the evanescent field region. By using carefully designed coupling structures at the waveguide boundaries, the system efficiently transfers light from the waveguide into the evanescent field mode, minimizing losses while maintaining the exponential decay profile necessary for high vertical resolution.
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 high-resolution imaging with a compact setup, reducing the need for large optical components and enabling fast, efficient data acquisition of densely arranged objects like DNA sequences.
Implementation Method 1
at least one waveguide configured for propagation of light along an extension of the waveguide
Implementation Method 2
said slab layer being configured for propagation of light in the plane
Implementation Method 3
the light distribution device is further configured to allow at least some of the light being propagated in the at least one waveguide to be coupled into the slab layer through the at least one light coupling edge across the gap
Implementation Method 4
the slab layer is configured to propagate the light coupled into the slab layer from the at least one waveguide such that an interference pattern is formed by interference of light in the slab layer
Implementation Method 5
the interference pattern has an evanescent light field outside the slab layer, wherein the evanescent light field of the interference pattern is configured to illuminate a sample in close relation to the slab layer
Data Source
Figure 1i~1iii
Figure 2A
Figure 2B~2C
AI summary
According to an aspect of the present inventive concept there is provided a light distribution device comprising a waveguide comprising a light coupling portion for light propagation, and a slab layer comprising a light coupling edge arranged at a boundary of the slab layer, configured for light propagation. The light coupling portion extends alongside and at a distance from the light coupling edge, forming a gap therebetween. The light distribution device is configured to allow light in the waveguide to be coupled into the slab layer across the gap. The slab layer is configured to propagate light coupled into the slab layer such that an interference pattern is formed in the slab layer, and for control of the interference pattern by tuning at least one of a phase, a wavelength, an amplitude, or a polarization of light propagated in the waveguide and/or by tuning a medium property of the slab layer and/or the waveguide and/or, in case the light distribution device comprises a plurality of waveguides, by control of active waveguides.