Sub-micron Cavity SPR Sensors for Miniaturized Bio-detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current surface plasmon resonance (SPR) sensors are limited by sensitivity, size, complexity, and cost, making them unsuitable for bio-defense, high-throughput drug discovery, and point-of-care testing, particularly in detecting bio-terrorism agents and continuous monitoring of infectious diseases.
Innovation Solution
The development of sub-micron surface plasmon resonance (MSPR) sensors that utilize stationary surface plasmon waves and micro-cavity resonators, eliminating the need for polarized light sources and complex optics, allowing for enhanced sensitivity and miniaturization, enabling real-time monitoring of biochemical interactions in micro-fluidic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SPR sensors are used, then detection capability is achieved, but device size and complexity increase
Solution Approach 1:
The patent segments the traditional planar SPR sensor into multiple sub-micron cavity sensors arranged in arrays. Each cavity acts as an independent sensing element with dimensions much smaller than conventional SPR sensors, enabling miniaturization while maintaining detection functionality through parallel operation of multiple segments
Solution Approach 2:
The patent transitions from two-dimensional planar SPR sensing to three-dimensional cavity-based sensing. The cavity structures provide vertical confinement of electromagnetic fields, creating a new dimension for enhancing light-matter interaction and improving sensitivity without increasing lateral device footprint
2Measurement precision
If traditional SPR sensors are used, then detection capability is achieved, but optical system complexity increases
Solution Approach 1:
The cavity sensors are designed to be self-resonating structures that generate their own electromagnetic field confinement and enhancement. The cavities themselves serve as both the sensing element and the optical resonator, eliminating the need for separate complex optical systems to create and control evanescent fields
Solution Approach 2:
The patent changes the operating parameters from requiring polarized light at specific angles (traditional SPR) to using unpolarized or differently polarized light at normal or oblique incidence. The cavity resonance conditions are tuned through geometric parameters rather than optical polarization control, simplifying the optical system
3Adaptability or versatility
If traditional SPR sensors are used, then biosensing function is provided, but cost increases
Solution Approach 1:
The patent divides the sensing function into multiple inexpensive sub-micron cavity elements that can be manufactured using standard semiconductor fabrication techniques. This segmentation allows for mass production and integration into cost-effective platforms, reducing the cost per sensing element
Solution Approach 2:
The patent uses identical replicated cavity structures across the sensor array, where each cavity is a copy of the optimized design. This replication approach enables standardized manufacturing processes and reduces development costs through design reuse across multiple sensing elements
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
MSPR sensors provide a compact, cost-effective solution for sensitive and real-time detection of biochemical interactions, enabling continuous monitoring of diseases and bio-hazards, with improved sensitivity and reduced complexity compared to traditional SPR sensors.
Implementation Method 1
sub-micron surface plasmon resonance (MSPR) sensors that utilize stationary surface plasmon waves and micro-cavity resonators
Data Source
AI summary
Wearable or implantable devices combining microfluidic control of sample and reagent flow and micro-cavity surface plasmon resonance sensors functionalized with surface treatments or coatings capable of specifically binding to target analytes, ligands, or molecules in a bodily fluid are provided. The devices can be used to determine the presence and concentration of target analytes in the bodily fluids and thereby help diagnose, monitor or detect changes in disease conditions.