Photonic Crystal Microarray for Parallel Sensing and Low-Loss Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photonic crystal microarray devices for multiple analyte sensing face challenges in achieving high sensitivity and signal-to-noise ratio due to poor optical confinement and inefficient coupling of light between ridge waveguides and photonic crystal waveguides, leading to unsuitable designs for high sensitivity sensing and preservation of biomolecule functionality during patterning.
Innovation Solution
A photonic crystal microarray structure featuring a semiconductor core with a triangular lattice of holes, integrated with two-dimensional photonic crystal waveguides and microcavities, allowing for high dielectric contrast and efficient light coupling, along with a novel microfluidic technique for patterning biomolecules at room temperature to preserve functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ridge waveguides are used to couple with individual photonic crystal microcavities, then parallel sensing capability is improved, but transmission loss at each interface increases significantly, reducing signal-to-noise ratio
Solution Approach 1:
The patent merges multiple photonic crystal waveguides into a single shared waveguide structure that couples with multiple microcavities simultaneously. This consolidation reduces the number of interfaces from multiple separate ridge-waveguide connections to a single integrated photonic crystal waveguide, thereby minimizing transmission loss while maintaining parallel sensing capability across multiple analytes.
Solution Approach 2:
The single photonic crystal waveguide serves multiple functions by coupling with multiple different microcavities that detect different analytes. This universal waveguide structure enables parallel sensing of multiple substances simultaneously without requiring separate dedicated waveguides for each sensing element, improving both efficiency and signal-to-noise ratio.
2Ease of manufacture
If one-dimensional photonic crystal structures are used, then fabrication is simplified, but optical confinement is poor and resonant peak linewidths are wide, reducing sensitivity
Solution Approach 1:
The patent transitions from one-dimensional photonic crystal structures to two-dimensional photonic crystal waveguides with a triangular lattice arrangement. This dimensional enhancement provides superior optical confinement in the transverse direction, resulting in narrower resonant peak linewidths and significantly improved sensitivity for detecting refractive index changes, while maintaining compatibility with standard semiconductor fabrication processes.
3Manufacturing precision
If high-temperature processing is used for patterning biomolecules, then lithographic resolution is improved, but biomolecule functionality is compromised or destroyed
Solution Approach 1:
The patent changes the temperature parameter from high-temperature lithographic processing to room-temperature microfluidic patterning. This parameter modification allows biomolecules to be deposited and patterned on the photonic crystal device without thermal denaturation, preserving their biological functionality while achieving sufficient spatial resolution for selective analyte 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
This configuration enhances sensitivity and measurement throughput by enabling label-free, parallel sensing of multiple analytes with improved signal-to-noise ratio and maintains biomolecule functionality, reducing costs associated with labeling and high-temperature processing.
Implementation Method 1
Tight confinement of the optical field in photonic crystal microcavities leads to a strong interaction with the surrounding ambient in the vicinity of the microcavity, thereby leading to large sensitivity to changes in refractive index of the ambient
Implementation Method 2
the slow light effect due to reduced group velocity in two-dimensional photonic crystal waveguides that would otherwise enhance coupling efficiency and thereby improve signal-to-noise ratio of sensing
Implementation Method 3
Large refractive index sensitivity of photonic crystal microcavities is demonstrated for sensing applications
Data Source
AI summary
Methods and systems for label-free multiple analyte sensing, biosensing and diagnostic assay chips consisting of an array of photonic crystal microcavities along a single photonic crystal waveguide are disclosed. The invention comprises an on-chip integrated microarray device that enables detection and identification of multiple species to be performed simultaneously using optical techniques leading to a high throughput device for chemical sensing, biosensing and medical diagnostics. Other embodiments are described and claimed.