Optical Analyte Detector Using TMD Monolayers for Wavelength Shift Detection
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Solution Overview
Problem
Current silicon photonic biosensors for analyte detection face inaccuracies due to evanescent field sensing, which can be influenced by environmental factors, posing risks in virus detection and other serious infections.
Innovation Solution
The optical analyte detector incorporates a silicon photonic biosensor design with transition metal dichalcogenide monolayers and microring resonators, utilizing wavelength shifts to detect analytes, where a primary microring resonator is optically coupled to a waveguide, and photodetectors compare wavelengths to determine analyte presence within a preset range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If evanescent field sensing is used in silicon photonic biosensors, then the sensing mechanism is simple and can be implemented with standard SOI technology, but the detection accuracy is reduced and the measurements are influenced by environmental factors
Solution Approach 1:
The patent introduces transition metal dichalcogenide monolayers as an intermediary sensing layer between the silicon waveguide and the analyte. This monolayer acts as a mediator that enhances the interaction between light and analyte molecules, providing more specific and accurate detection while reducing environmental interference. The monolayer is deposited on the silicon waveguide surface and functionalized with recognition elements for target analytes.
Solution Approach 2:
The patent employs a composite structure combining silicon photonic waveguides with transition metal dichalcogenide monolayers. This composite material approach integrates the optical guiding capabilities of silicon with the enhanced sensing properties of TMDs, creating a hybrid sensor that achieves both manufacturing feasibility and superior detection accuracy through the synergistic properties of the combined materials.
2Device complexity
If standard silicon photonic sensors are used, then the device structure is simple and fabrication is straightforward, but the detection reliability is compromised due to environmental influence
Solution Approach 1:
The transition metal dichalcogenide monolayer serves as a protective intermediary layer that shields the silicon waveguide from direct environmental exposure while maintaining optical coupling. This intermediary structure enhances detection reliability by providing a stable, controlled interface between the photonic component and the biological sample, reducing the impact of environmental fluctuations.
Solution Approach 2:
The patent modifies the optical parameters of the sensor system by introducing the TMD monolayer, which changes the evanescent field distribution and coupling characteristics. This parameter change enhances the sensor's reliability by creating a more stable optical response that is less sensitive to environmental variations while maintaining high detection capability.
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 design enhances detection accuracy by stabilizing wavelength shifts, allowing for precise analyte detection, as demonstrated by calibration curves and plots showing COVID-19 concentration and infection days, improving reliability in viral infection diagnosis.
Implementation Method 1
A primary microring resonator is embedded in the optical layer, adjacent the fourth waveguide, such that the primary microring resonator is optically coupled to the fourth waveguide
Implementation Method 2
First, second, and third waveguides are each embedded in the optical layer, with the second and third waveguides optically coupled to the first waveguide by a first optical splitter
Data Source
AI summary
The optical analyte detector is a photonic detector that uses a measured wavelength shift to determine the presence of an analyte. An open cell is formed in an optical layer for receiving a sample to be analyzed. A transition metal dichalcogenide monolayer defines a bottom wall of the open cell, and the transition metal dichalcogenide monolayer is formed directly above a microring resonator. A waveguide is positioned adjacent to the open cell, and is spaced apart therefrom by a gap. The waveguide is coupled to the microring resonator, and the transition metal dichalcogenide monolayer is functionalized with an adsorbed layer for detection of a specific analyte. Molecular binding takes place if a sample of the analyte contacts the adsorbed layer, which induces a wavelength shift in light transmitted through the waveguide. The presence of this measured wavelength shift indicates positive detection of the analyte.