AFM Probe Decoupling via Optical Interferometry
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Solution Overview
Problem
Current atomic force microscopes (AFM) face limitations in spatial resolution, probe fragility, and cost, as well as difficulties in measuring different surface parameters simultaneously and processing surfaces during measurement, especially in environments other than air.
Innovation Solution
A device with a sample holder and hybrid probes that can detect and modify surface parameters, allowing for simultaneous measurement and processing of surfaces using a single system, featuring a deformable sample holder with high bending stiffness and interchangeable probes for precise surface evaluation and modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a micrometric or millimetric probe is used to achieve high measurement precision, then the spatial resolution is improved, but the probe becomes fragile and expensive requiring frequent replacement
Solution Approach 1:
The system separates the probe (tuning fork) from the detection sensor, allowing the probe to be a simple macroscopic structure while the sensing function is performed by a separate optical interferometer. This segmentation enables use of robust macroscopic probes instead of fragile micrometric ones.
Solution Approach 2:
An optical interferometer acts as an intermediary between the probe and the measurement system. The interferometer detects probe position and surface interactions optically, eliminating the need for fragile micrometric probe structures while maintaining high measurement precision.
2Reliability
If a macroscopic probe is used to reduce cost and increase durability, then probe reliability is improved, but the coupling with measurement elements may deteriorate detection performance
Solution Approach 1:
The optical interferometer serves as an intermediary that couples the macroscopic probe to the measurement system without being mechanically coupled. This optical coupling maintains high detection sensitivity while allowing use of robust macroscopic probe structures.
Solution Approach 2:
The patent replaces mechanical coupling between probe and sensor with optical coupling via interferometry. This substitution allows macroscopic probes to be used without sacrificing detection performance, as the optical system can detect extremely small displacements of the probe.
3Adaptability or versatility
If multiple probes are used to measure different surface parameters simultaneously, then measurement versatility is improved, but device complexity increases
Solution Approach 1:
The optical interferometer serves as a universal detection system that can measure multiple parameters (position, force, displacement) with a single probe. This multi-functional detection approach eliminates the need for multiple specialized probes and reduces overall system complexity.
Solution Approach 2:
The system allows a single probe to perform multiple measurement functions by detecting different aspects of probe-surface interaction through the optical interferometer, thereby achieving measurement versatility without requiring multiple probes or increasing device complexity.
4Reliability
If the probe mass is increased to reduce coupling effects, then measurement reliability is improved, but the resolution of interaction force measurement deteriorates
Solution Approach 1:
The patent replaces mechanical force measurement with optical detection of probe displacement. The optical interferometer can detect extremely small changes in probe position, enabling high-resolution force measurements even with macroscopic probe masses, thus resolving the trade-off between probe mass and force measurement sensitivity.
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
Enhances measurement precision, reduces probe costs, and simplifies surface evaluation in various environments by decoupling the probe from the sensor, enabling multiple parameter measurements and modifications with improved spatial resolution and reduced instrument complexity.
Implementation Method 1
The device comprises an optical interferometer configured to detect a position of the probe
Implementation Method 2
a piezoelectric actuator configured to move the probe towards and away from the surface
Implementation Method 3
The probe is configured to vibrate at a resonant frequency of the probe
Data Source
AI summary
The present invention relates to a device for measuring and/or modifying a surface of a sample, including a sample holder, including a first area configured to receive the sample fixedly mounted relative to the first area, a support, a first probe configured to detect a first parameter at a point of the surface and to generate a first measurement signal representative of the first parameter, and a second probe configured to detect a second parameter at a point of the surface, and to generate a second measurement signal representative of the second parameter, the first parameter being different from the second parameter, or one of the first probe and the second probe being configured to modify a third parameter of the surface at the point of the surface.