Nondegenerate Two-Wave Mixing for Particle Radius Determination
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Solution Overview
Problem
Current methods for analyzing biomolecules such as proteins, antibodies, and DNA strands, like electrophoresis and dielectrophoresis, are time-consuming, complex, and not suitable for analyzing small quantities or living cells, and lack precision in determining particle radius and mass.
Innovation Solution
The method employs nondegenerate two-wave mixing in colloidal suspensions using low-intensity, Doppler-shifted optical waves to create a moving intensity grating that interacts with particles, allowing for the determination of particle radius by measuring energy exchange and frequency shifts, which is faster, more accurate, and applicable to small volumes and living cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrophoresis or dielectrophoresis is used to separate and analyze biomolecules, then separation and identification can be achieved, but the process becomes time-consuming and complex
Solution Approach 1:
The patent replaces mechanical/electrical separation methods (electrophoresis, dielectrophoresis) with an optical measurement system. Two intersecting laser beams create a stationary interference pattern that acts as a optical ruler for direct measurement of particle radius through light scattering, eliminating the need for time-consuming electrical separation processes while maintaining measurement precision.
Solution Approach 2:
The patent creates an optical copy or representation of the particle's physical dimensions through its scattering pattern. The interference fringes produced by light scattering contain encoded information about particle radius, allowing direct optical measurement without physical separation or manipulation of the particles.
2Measurement precision
If conventional electrophoresis methods are used, then biomolecule separation is possible, but the complexity of the equipment and procedure increases
Solution Approach 1:
The patent replaces complex electrical separation equipment (power supplies, electrode systems, buffer solutions) with a relatively simple optical system consisting of two laser beams and a detector. The interference pattern created by the lasers serves as the measurement reference, eliminating the need for complex electrical apparatus while achieving precise particle radius determination.
Solution Approach 2:
The patent changes the measurement parameter from electrical properties (mobility, charge) to optical properties (light scattering angle, interference pattern). This parameter change simplifies the equipment needed, as optical measurement requires only light sources and detectors rather than complex electrical separation systems.
3Quantity of substance
If traditional methods are used for analyzing small quantities of biomolecules, then analysis can be performed, but the precision in determining particle radius and mass is insufficient
Solution Approach 1:
The patent uses the wave nature of light (optical vibration) to create an interference pattern with a known spatial period. This optical vibration serves as a precise ruler that can measure particle dimensions even in small sample volumes, as the measurement depends on the wavelength of light rather than the quantity of sample material.
Solution Approach 2:
The patent utilizes the wavelength-dependent nature of light scattering to determine particle size. By analyzing the angular distribution of scattered light at different wavelengths or the interference pattern produced, precise particle radius can be determined from minimal sample quantities, as the optical interaction is sensitive to particle dimensions rather than sample concentration.
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 enables rapid analysis of biomolecules, providing accurate determination of particle radius and mass, and can differentiate between molecules based on size and shape, with potential for in vivo applications and reduced reagent use.
Implementation Method 1
superposing first and second Doppler-shifted optical waves having a variable frequency shift between them in the medium
Implementation Method 2
first and second Doppler-shifted optical waves
Implementation Method 3
the forces resulting from the application of radiation pressure on particles in a colloidal suspension due to the interference of optical waves
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
A method and apparatus for determining a radius of particles suspended in a medium includes superposing first and second Doppler- shifted optical waves having a variable frequency shift between them in the medium such that there is a gain in energy of the first optical wave with respect to the second optical wave, varying the frequency shift and measuring the gain while varying the frequency shift to determine the value of the frequency shift at which there is a peak in the gain, and determining the radius of the particles based on the value of the frequency shift at which there is a peak in the gain.