Resin Dielectric Prism Recessed Sink-Mark Surface
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Solution Overview
Problem
The use of resin dielectric prisms in surface plasmon resonance measurement devices often results in poor polarization state maintenance, leading to reduced measurement sensitivity and precision due to internal stress and birefringence issues, which are costly to correct.
Innovation Solution
A dielectric prism with a recessed sink-mark surface is used, optimized through specific injection molding techniques to reduce internal stress and improve polarization state maintenance, incorporating a resin material with a low photoelastic coefficient to enhance P-polarization component maintenance rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin dielectric prism is used to reduce cost, then manufacturing cost is reduced, but polarization state maintenance deteriorates due to internal stress and birefringence
Solution Approach 1:
The patent changes the physical parameters of the resin material by selecting specific resin types with low photoelastic coefficients and controlling the molding parameters (temperature, pressure, cooling rate) to minimize internal stress and birefringence, thereby maintaining polarization state while using cost-effective resin materials
Solution Approach 2:
The patent employs composite structures by combining resin dielectric prisms with metal films (such as gold or silver) and optionally additional functional layers, where the metal film provides the surface plasmon resonance functionality while the resin prism is optimized to maintain polarization, achieving both cost reduction and performance maintenance
2Ease of manufacture
If resin material is used for the dielectric prism, then production cost is reduced, but measurement sensitivity deteriorates due to poor polarization maintenance
Solution Approach 1:
The patent optimizes resin material parameters by selecting materials with specific properties (low photoelastic coefficient, appropriate refractive index) and controlling molding parameters to maintain polarization state, thereby preserving measurement sensitivity while achieving cost reduction through resin usage
3Measurement precision
If internal stress is reduced in the resin prism, then polarization state maintenance improves, but manufacturing complexity increases
Solution Approach 1:
The patent reduces internal stress by optimizing molding parameters (temperature profiles, pressure sequences, cooling rates) and selecting resin materials with appropriate mechanical properties, achieving better polarization maintenance through parameter optimization rather than adding complex manufacturing steps
Solution Approach 2:
The patent employs disposable resin-based sensor chips that are pre-fabricated with optimized stress characteristics, allowing each chip to be inexpensive and single-use while maintaining high polarization performance through factory optimization, eliminating the need for complex stress management during operation
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 allows for high-sensitivity and precise surface plasmon resonance measurements at a lower cost by maintaining a uniform polarization state distribution, improving measurement sensitivity and precision while reducing production costs.
Implementation Method 1
When excitation light which advances through the inside of the dielectric prism is incident on an interface between the metal film and the dielectric prism while satisfying the total reflection, an evanescent wave leaks out from the interface.
Implementation Method 2
interference between surface plasmons of the metal film and the evanescent wave is occurred. Further, the surface plasmons and the evanescent wave resonate at an angle at which a resonance angle is set to the incident angle of the excitation light to the interface.
Implementation Method 3
heat generated when the prism is formed and internal strain due to stress cause a disorder in a polarization state of the excitation light incident on the prism
Data Source
AI summary
A prism used in analysis utilizing surface plasmons is prism of a dielectric medium with a predetermined reflective index. Trapezoidal prism comprises an incident surface on which excitation light is incident from outside, a reflective surface at which the excitation light incident on the incident surface is reflected, an emission surface from which the excitation light reflected by the reflective surface is emitted; and an opposite surface which opposes the reflective surface. The opposite surface is a recessed sink mark surface.