Phase Singularity Tracking for Optical Measurement Sensitivity
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Solution Overview
Problem
Current optical measurement techniques lack the sensitivity and spatial resolution needed to effectively monitor changes in the properties and vicinity of targets, particularly in industrial applications such as semiconductor inspection and biosensing, where precise detection of environmental changes and foreign substances is crucial.
Innovation Solution
The phase singularity tracking (PST) technique utilizes measured data to identify and track phase singularity points in a two-dimensional parametric space, such as spectro-angular space, allowing for exceptionally high sensitivity and spatial resolution in monitoring changes in a target's status, including refractive index and structural parameters, by analyzing the phase singularity signature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical measurement techniques are used, then the measurement system is simple and easy to operate, but the sensitivity and spatial resolution are insufficient for detecting subtle changes in target properties
Solution Approach 1:
The patent transitions from conventional single-parameter optical measurements to two-dimensional phase singularity mapping in spectro-angular space. By introducing a second dimension (angular spectrum) alongside spectral analysis, the system achieves enhanced sensitivity and spatial resolution through phase singularity point tracking, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The invention changes the measurement parameter from intensity-based detection to phase-based detection. By monitoring phase singularity points in the complex optical field rather than simple intensity variations, the system achieves superior sensitivity to refractive index changes and target property variations while maintaining operational feasibility
2Reliability
If conventional optical measurement techniques are used, then the device complexity is low, but the ability to detect foreign substances and environmental changes is limited
Solution Approach 1:
The patent introduces phase singularity points as intermediary markers that mediate between the optical field and the target properties. These phase singularities act as sensitive indicators that translate subtle changes in refractive index, target structure, or environmental conditions into measurable positional shifts, thereby enhancing detection capability without requiring direct complex interaction with the target
Solution Approach 2:
The invention applies local quality analysis by focusing measurements on specific phase singularity points within the spectro-angular space rather than analyzing the entire optical field uniformly. This localized approach enhances detection sensitivity for specific target regions and properties while managing system complexity through selective monitoring
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
PST enables precise detection of changes in target properties and environmental conditions with high sensitivity and spatial resolution, facilitating improved yield management in semiconductor manufacturing and advanced biosensing capabilities.
Implementation Method 1
The measured data comprises phase data indicative of a two-dimensional profile of full phase of an optical response of the target in a predetermined two-dimensional parametric space
Implementation Method 2
a point characterized by that a physical phase of the measured optical response continuously accumulates a nonzero integer multiple m of 2π around said point
Data Source
AI summary
A monitoring system and method are presented for use in monitoring a target. The monitoring system comprises: an input utility for receiving input data comprising measured data indicative of optical response of the target measured under predetermined conditions and comprising phase data indicative of a two-dimensional profile of full phase of the optical response of the target in a predetermined two-dimensional parametric space including a two-dimensional range in which said target exhibits phase singularity; an analyzer module for processing said measured data and extracting at least one phase singularity signature of the target characterizing the target status, the phase singularity signature being formed by a number N of phase singularity points, each corresponding to a condition that the physical phase continuously accumulates a nonzero integer multiple m of 2π around said point.