Photodetector Resin Layer Triangular Cross-Section Light Guidance
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Solution Overview
Problem
Existing photodetectors face reduced sensitivity and crosstalk issues due to obliquely scattered visible light, which is not efficiently directed to the photodetection elements and often incident on adjacent elements.
Innovation Solution
A photodetector design featuring a transparent resin layer with a triangular cross-section and a scintillator that converts ultraviolet light into visible light, guiding the visible light to the photodetection elements while minimizing oblique incidence and crosstalk by optimizing the acute angle between the resin layer's inclined surface and the plane direction, typically between 30° to 45°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultraviolet light is converted into visible light using a scintillator, then the photodetection sensitivity is improved, but obliquely scattered visible light is not incident on the photodetection element and causes crosstalk
Solution Approach 1:
The patent introduces a resin layer with a triangular cross-section that adds a dimensional structure to guide light. This triangular prism structure refracts obliquely scattered visible light at multiple interfaces, redirecting it toward the photodetection element and converting harmful oblique incidence into useful vertical incidence.
Solution Approach 2:
The resin layer acts as an intermediary between the scintillator and the photodetection element. It receives obliquely scattered visible light from the scintillator, refracts and guides it through its triangular structure, and delivers the light vertically to the photodetection element, thereby eliminating crosstalk while preserving detection sensitivity.
2Productivity
If the acute angle of the resin layer's inclined surface is optimized to guide light, then photodetection efficiency is improved, but the structural complexity increases
Solution Approach 1:
The patent optimizes the acute angle of the resin layer's inclined surface to be between 30° and 60° to achieve optimal light guidance. By carefully selecting this angular parameter, the structure efficiently refracts and guides obliquely scattered light toward the photodetection element while maintaining manufacturing feasibility.
Solution Approach 2:
The resin layer is formed as a transparent resin structure that can be integrated with the scintillator and photodetection element. This composite structure combines the light-converting properties of the scintillator with the light-guiding properties of the resin layer, achieving enhanced photodetection efficiency without requiring separate complex optical components.
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 photodetection efficiency by increasing the amount of light incident on the photodetection elements while reducing crosstalk and noise, thereby improving the overall performance of the photodetector.
Implementation Method 1
a scintillator that converts ultraviolet light into visible light
Implementation Method 2
guiding the visible light to the photodetection elements while minimizing oblique incidence and crosstalk by optimizing the acute angle between the resin layer's inclined surface and the plane direction
Data Source
AI summary
A photodetector includesa structure that converts ultraviolet light into visible light; anda photodetection element that detects the visible light converted by the structure,wherein the structure is provided on the photodetection element and protrudes in a predetermined shape on a side opposite to the photodetection element.