Integrated Optical Chemical Surface Feature Characterization
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Solution Overview
Problem
Current methods for inspecting articles, such as hard disk drives, require multiple analytical apparatuses and lengthy processes, limiting throughput in root cause failure analysis due to the need for separate optical and chemical characterization of surface and subsurface defects.
Innovation Solution
An apparatus comprising an optical characterization device, a photon detector array, and a chemical characterization means that sequentially processes photons scattered from articles to detect, map, and characterize surface features, reducing the need for multiple analyses by producing differential surface feature maps that provide both positional and chemical information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple analytical apparatuses are used for separate optical and chemical characterization, then measurement precision is improved, but device complexity and analysis time increase
Solution Approach 1:
The patent combines multiple analytical apparatuses (optical microscope, Raman spectrometer, AFM) into a single integrated inspection system. The apparatus includes a photon emitter, photon detector array, and optical characterization device that can perform both optical imaging and chemical characterization simultaneously, eliminating the need for separate analysis equipment and reducing overall system complexity.
Solution Approach 2:
The inspection apparatus is designed with multi-functional capabilities to perform diverse characterization tasks using a single system. The optical characterization device can detect surface features, subsurface defects, and chemical composition through different detection modes (optical imaging, Raman spectroscopy, atomic force microscopy), making the apparatus universally applicable for comprehensive defect analysis.
2Measurement precision
If multiple analytical apparatuses are used for separate optical and chemical characterization, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The integrated apparatus enables continuous inspection by performing optical and chemical characterization in a single uninterrupted process. The system sequentially activates different detection modes (optical imaging first, then Raman spectroscopy, followed by AFM if needed) without requiring physical relocation of the sample or interruption of the inspection workflow, thereby maintaining continuous productive action.
Solution Approach 2:
By merging multiple analytical functions into one apparatus, the patent eliminates the time required to transfer samples between different equipment and the overhead of setting up separate analysis protocols. The integrated system processes both optical and chemical data in a unified workflow, significantly reducing total analysis time and improving productivity.
3Device complexity
If sequential photon detection and processing is used, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The apparatus performs preliminary optical imaging detection first to identify and locate surface features and defects. Based on these preliminary results, the system then selectively applies more sophisticated chemical characterization (Raman spectroscopy, AFM) only to regions of interest. This preliminary action approach maintains measurement precision by ensuring detailed analysis is applied where needed while avoiding unnecessary complexity in regions without defects.
Solution Approach 2:
The inspection process is segmented into distinct detection stages: initial optical imaging to map surface features, followed by selective Raman spectroscopy for chemical identification, and optional AFM for topographic analysis. Each stage processes specific types of information and passes results to the next stage, maintaining measurement precision through systematic segmentation while keeping the overall device complexity manageable.
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 significantly reduces the time and number of analyses required, enhancing throughput in root cause failure analysis and enabling faster detection and characterization of defects like particle contamination, scratches, and voids on articles.
Implementation Method 1
a photon detector array configured to sequentially receive a first set of photons scattered from surface features of an article and a second set of photons scattered from surface features of the article
Data Source
AI summary
Provided herein is an apparatus, including an optical characterization device; a photon detector array configured to sequentially receive a first set of photons scattered from surface features of an article and a second set of photons scattered from surface features of the article and subsequently processed by the optical characterization device; and a chemical characterization means for chemically characterizing the surface features of the article, wherein the chemical characterization means is configured for processing the first set of photons received by the photon detector array and the second set of photons received by the photon detector array.