Metamaterial Sensor Transmittance Control via Squeegee Concentration
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Solution Overview
Problem
Conventional methods for sensing materials using metamaterials, such as the drop casting method, result in disproportionate distribution of target materials on the sensing device, leading to inefficient concentration and poor signal quality, especially for low-concentration samples, due to phenomena like the coffee-ring effect and flocculation.
Innovation Solution
A system and method utilizing a squeegee to concentrate target materials inside slots on a metamaterial sensing device, where electromagnetic waves are amplified, allowing for controlled adjustment of transmittance by sliding the squeegee to sweep and concentrate the material within the slots, thereby enhancing signal amplification and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the drop casting method is used to apply the solution containing target material to the metamaterial surface, then the material can be deposited on the substrate, but the target material becomes disproportionately distributed with flocculation at the outer region and empty central portion
Solution Approach 1:
The patent applies a surfactant to the metamaterial substrate before applying the target material solution. This preliminary action modifies the surface properties to prevent coffee-ring effect and flocculation, ensuring uniform distribution of target material throughout the droplet area including the central portion, thereby resolving the distribution uniformity issue
Solution Approach 2:
The surfactant acts as an intermediary substance between the metamaterial substrate and the target material solution. It mediates the interaction by reducing surface tension and preventing premature evaporation and flocculation, allowing uniform distribution of target material across the substrate surface
2Measurement precision
If the target material is disproportionately distributed on the metamaterial substrate, then the material can be detected, but the signal amplification efficiency is reduced and qualitative and quantitative analysis is limited
Solution Approach 1:
By applying surfactant before the target material solution, the patent ensures that target material distributes uniformly across the substrate including the central sensing region. This preliminary surface modification prevents material accumulation at edges and ensures sufficient target material concentration in the sensing area for effective signal amplification
Solution Approach 2:
The surfactant treatment creates locally optimized surface conditions across the entire substrate area, particularly in the central region where sensing occurs. This local modification ensures uniform wetting and material distribution in the critical sensing zone, enhancing detection sensitivity
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 approach effectively concentrates target materials within the amplification hotspots, improving signal strength and sensitivity, enabling efficient detection of low-concentration samples and allowing for adjustable transmittance control, comparable to conventional biosensors or mass spectrometry.
Implementation Method 1
a sensing device configured to amplify electromagnetic waves of a specific frequency
Implementation Method 2
a squeegee configured to concentrate a target material inside a slot formed in the sensing device
Data Source
AI summary
A system for adjusting transmittance, according to the present disclosure, includes a sensing device configured to amplify electromagnetic waves of a specific frequency and a squeegee configured to concentrate a target material inside a slot formed in the sensing device. A transmittance of the sensing device is adjusted according to concentration of the target material concentrated inside the slot by the squeegee.