Light Detection Device With Grating Coupling Layer and Shielding Film
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Solution Overview
Problem
Conventional light detection systems face limitations in measuring the coherence or phase of light, particularly in biological objects, due to the complexity of the Michelson interferometer configuration and limited depth resolution, which restricts their suitability for diagnosing small targets.
Innovation Solution
A light detection system comprising a light detector with a light coupling layer and a light shielding film, where the light coupling layer includes alternating low- and high-refractive-index layers with gratings, and the light shielding film has alternating light transmitting and shielding regions, allowing for improved detection of light amounts and coherence measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Michelson interferometer configuration is used to measure light coherence, then coherence measurement capability is achieved, but device complexity increases
Solution Approach 1:
The light detector is segmented into first detectors and second detectors disposed along the main surface, with corresponding light transmitting regions and light shielding regions in the light shielding film, allowing coherence measurement through spatial separation rather than complex interferometric paths
Solution Approach 2:
The patent extracts the coherence measurement function from the complex Michelson interferometer configuration and implements it through a simplified detector array with light shielding film, removing unnecessary optical components while retaining the essential measurement capability
2Measurement precision
If conventional light detection systems are used, then basic light detection is achieved, but depth resolution is limited
Solution Approach 1:
The patent introduces depth resolution by detecting light amounts at multiple detector positions along the main surface, effectively adding a depth dimension to the detection capability through spatial arrangement rather than increasing temporal complexity
Solution Approach 2:
Different regions of the light shielding film (light transmitting regions vs. light shielding regions) are assigned different functions to detect different depth information, with each local region optimized for specific depth range detection
3Measurement precision
If time division method is used for detection, then scattering differences can be detected, but measurement process becomes complex and time-consuming
Solution Approach 1:
Instead of sequential time-division detection, the patent uses simultaneous spatial detection with multiple detectors and light shielding regions, eliminating the need for periodic time-division measurement while maintaining scattering difference detection capability
Solution Approach 2:
The patent merges multiple detection functions into a single detector structure with multiple detectors and light shielding regions, allowing simultaneous detection of different depth information and scattering differences in one measurement 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 configuration enhances the resolution and simplifies the measurement process, enabling effective detection of scattering differences within biological subjects without requiring time division, thus improving the depth resolution and coherence measurement capabilities.
Implementation Method 1
The light coupling layer includes a first low-refractive-index layer, a first high-refractive-index layer that is disposed on the first low-refractive-index layer and includes a first grating, and a second low-refractive-index layer that is disposed on the first high-refractive-index layer. The first high-refractive-index layer has a higher refractive index than the first low-refractive-index layer and the second low-refractive-index layer.
Implementation Method 2
The first high-refractive-index layer includes a first grating
Data Source
AI summary
A light detection device includes a light detector including first detectors and second detectors both disposed along a main surface; a light coupling layer disposed on or above the light detector; and a light shielding film disposed on the light coupling layer. The light coupling layer includes a first low-refractive-index layer, a first high-refractive-index layer that is disposed on the first low-refractive-index layer and includes a first grating, and a second low-refractive-index layer that is disposed on the first high-refractive-index layer. The light shielding film includes a light transmitting region and a light shielding region adjacent to the light transmitting region. The light transmitting region faces two or more first detectors included in the first detectors, and the light shielding region faces two or more second detectors included in the second detectors.