Metrological Scanning Probe Microscope with Multi-Beam Optical Detection
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Solution Overview
Problem
Current scanning probe microscopes (SPMs) and atomic force microscopes (AFMs) face challenges in measuring small forces with minimal noise and achieving faster imaging rates, particularly when using smaller cantilevers for applications like optical techniques, nanoindentation, and electrochemistry, as they struggle to maintain resolution and accuracy.
Innovation Solution
The design involves an optical beam positioning unit that focuses multiple light beams congruently onto a single cantilever or sample using a single objective lens, allowing independent control of the focus location and orientation of each beam, enabling precise measurement and manipulation of probe deflection or oscillation, and facilitating functionalities beyond displacement measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If smaller cantilevers are used to achieve faster imaging rates, then imaging speed is improved, but measurement precision deteriorates due to increased noise and reduced force measurement accuracy
Solution Approach 1:
The optical detection system is segmented into multiple independent laser beams, each targeting specific regions of the cantilever. This allows simultaneous measurement of different cantilever parameters (deflection, oscillation, frequency) using separate beams, enabling precise force measurement even with smaller, faster cantilevers.
Solution Approach 2:
The optical detection system is designed to perform multiple functions simultaneously: static deflection measurement, dynamic oscillation detection, frequency measurement, and photothermal excitation. This multi-functional approach allows the system to maintain measurement precision across different operating modes while using smaller cantilevers for faster imaging.
2Adaptability or versatility
If multiple light beams are used for various functionalities, then versatility is improved, but device complexity increases
Solution Approach 1:
Multiple optical functions (deflection detection, oscillation detection, excitation) are merged into a single integrated optical detection system. Multiple laser beams are combined and directed through a unified optical path to the cantilever, reducing the need for separate optical systems for each function and simplifying overall device complexity.
Solution Approach 2:
The patent introduces an intermediary optical system that acts as a mediator between the light sources and the cantilever. This intermediary system includes beam combining optics, positioning mechanisms, and detection optics that coordinate multiple beams, enabling versatile functionality while maintaining manageable system complexity through centralized control.
Data Source
AI summary
This invention relates to a metrological scanning probe microscope system combining an SPM which employs an optical lever arrangement to measure displacement of the probe indirectly with another SPM which measures the displacement of the probe directly through the use of an interferometric detection scheme.