Photon Emitter Array for Nanometer Defect Characterization
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Solution Overview
Problem
Existing methods for inspecting articles, such as hard disk drives, fail to effectively detect and characterize surface and subsurface defects like particle contamination, scratches, and voids, which can degrade performance and lead to manufacturing issues.
Innovation Solution
An apparatus comprising two photon emitters and a photon detector array that emits photons onto an article's surface and detects scattered photons to create differential surface feature maps, allowing for the characterization of defects smaller than 500 nm in dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used, then the inspection process is simple, but the detection precision for nanometer-sized defects is insufficient
Solution Approach 1:
The apparatus segments the inspection task by using multiple photon emitters operating at different angles to probe different aspects of surface features. Each emitter-detector pair provides complementary information, enabling comprehensive characterization of nanometer-sized defects that single-angle methods cannot detect
Solution Approach 2:
The invention transitions from conventional single-angle inspection to multi-angle inspection by positioning photon emitters and detectors at different angular orientations. This dimensional addition in angular space enables the detection and characterization of surface features with dimensions below 500 nm that are invisible to conventional methods
2Measurement precision
If high-resolution detection of surface features is implemented, then defect detection capability improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The apparatus uses scattered photons as an intermediary to indirectly probe surface features. Instead of directly imaging nanometer-sized defects, the system detects photons scattered by these features, converting an impossible direct measurement into a feasible indirect measurement through light scattering interactions
Solution Approach 2:
The invention changes the measurement parameters by varying the angle of photon incidence and detection. By measuring photon scattering at multiple angles, the system extracts different dimensional information about surface features, transforming an unmeasurable parameter (sub-500 nm surface feature size) into measurable scattering intensity variations
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 precise detection and mapping of nanometer-sized defects, improving product quality by differentiating between particle contamination and voids, thus maintaining high yields and ensuring accurate spacing between disk surfaces and read-write heads.
Implementation Method 1
a photon detector array comprising a plurality of photon detectors configured to detect photons scattered from features in the entire surface of the article
Data Source
AI summary
Provided herein is an apparatus, including two photon emitters and a photon detector array. The two photon emitters are configured to emit photons onto an entire surface of an article. The photon detector array includes a number of photon detectors configured to detect photons scattered from features in the entire surface of the article, wherein the features are less than 500 nm in their largest dimension.