SHG Defect Analysis for Bulk and Surface Device Inspection
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Solution Overview
Problem
Existing device analysis methods are inadequate for accurately detecting defects in non-linear optical materials, particularly in centrosymmetric materials where second harmonic generation (SHG) processes are limited to surfaces and interfaces, lacking precision and efficiency in defect characterization.
Innovation Solution
A device analysis method utilizing a first light signal incident at various angles and azimuth angles to detect a second light signal, enabling defect modeling based on the intensity and distribution of defects, with a device analysis apparatus comprising a light source, sample unit, detection unit, and analysis unit to determine device normalcy and model defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If second harmonic generation (SHG) process is used to detect defects in centrosymmetric materials, then surface and interface characteristics can be analyzed, but the detection is limited only to surfaces and interfaces and cannot detect bulk defects
Solution Approach 1:
The patent transitions from surface-only detection to three-dimensional bulk detection by introducing depth-resolved SHG measurement. The system scans through different depths of the material using focal depth modulation, enabling defect detection throughout the entire bulk volume rather than仅限于 surfaces and interfaces.
Solution Approach 2:
The patent employs dynamic focal depth adjustment to enable depth-resolved detection. The focal depth is modulated during measurement to scan through different layers of the material, allowing the system to detect defects at various depths and provide three-dimensional defect distribution information.
2Measurement precision
If conventional linear light detection is used, then the detection process is simple, but the accuracy of defect detection in non-linear optical materials is insufficient
Solution Approach 1:
The patent utilizes the non-linear optical parameter change in SHG process, where the generated light intensity is proportional to the square of the incident light intensity. By detecting this non-linear relationship and analyzing the polarization state changes, the system achieves high-precision defect detection specific to non-linear optical materials.
Solution Approach 2:
The patent replaces conventional linear optical detection with non-linear optical SHG detection. This substitution enables specific detection of defects in non-linear optical materials by exploiting the material's non-linear optical properties, providing higher accuracy for this specific application domain.
3Measurement precision
If multiple incident angles and azimuth angles are used to supply light signal, then defect distribution can be accurately determined, but the measurement time and complexity increase
Solution Approach 1:
The patent employs periodic modulation of the incident light polarization state and systematic angular scanning. By using periodic polarization modulation combined with controlled angular variation, the system efficiently collects defect distribution information from multiple angles without requiring continuous manual adjustment, reducing measurement time while maintaining accuracy.
Solution Approach 2:
The patent uses polarization state modulation to create multiple virtual measurement configurations from a single physical setup. By rotating the polarization state of the incident light, the system effectively simulates multiple incident angle measurements, reducing the need for physical repositioning and decreasing measurement time.
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
Enables quick and accurate defect detection and modeling in devices, predicting defect positions and densities, and optimizing manufacturing processes through precise analysis of second harmonic generation signals.
Implementation Method 1
Second harmonic generation (SHG) is a non-linear effect in which light is emitted with twice the frequency of an incident light beam
Implementation Method 2
detecting a second light signal reflected from the device
Data Source
AI summary
A device analysis method includes manufacturing a device, supplying a first light signal to the device at a plurality of incident angles or a plurality of azimuth angles, detecting a second light signal reflected from the device, determining whether the device is normal or defective by analyzing the second light signal, and when the device is a defective device, performing defect modeling on the defective device, wherein the performing of the defect modeling includes calculating a distribution of defects.