Scanning Probe Microscope Tilted Z-Scanner Overhang Analysis
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Solution Overview
Problem
Conventional scanning probe microscopes struggle to precisely analyze samples with overhang surface structures due to limitations in probe design, leading to incorrect data collection and high manufacturing costs.
Innovation Solution
A scanning probe microscope design that includes a first probe and scanner moving along a non-perpendicular straight line to a sample plane, with optional additional probes and scanners, and actuators to adjust the angle between the probe's movement and the sample plane, allowing for precise scanning of overhang structures without the need for costly and inefficient probe modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional probe with perpendicular scanning is used, then the device structure is simple, but it cannot precisely analyze samples with overhang structures
Solution Approach 1:
The patent applies dynamics by making the scanning system adjustable rather than fixed. The first scanner can be tilted to different angles using a tilting mechanism, allowing the probe to scan overhang structures at optimal angles. This dynamic adjustment capability enables the system to adapt to different sample geometries while maintaining measurement precision.
Solution Approach 2:
The patent introduces angular dimensionality by tilting the first scanner relative to the sample plane. Instead of only moving the probe in the vertical z-direction, the scanner can be tilted to create non-perpendicular scanning paths. This adds rotational freedom to the scanning motion, enabling access to overhang structures that would be invisible with perpendicular scanning only.
2Measurement precision
If probes are modified to scan overhang structures, then measurement precision improves, but manufacturing cost increases
Solution Approach 1:
The patent changes the operational parameters of the scanning system rather than modifying the probe itself. By adjusting the scanning angle through tilting the first scanner, the system achieves the ability to scan overhang structures using standard probes. This parameter change approach avoids the need for expensive custom probe manufacturing while maintaining measurement precision.
Solution Approach 2:
The patent makes the scanning system universal by designing it to handle both flat surfaces and overhang structures with the same probe. The tiltable first scanner allows a single standard probe to perform multiple scanning tasks at different angles, eliminating the need for specialized probes for different sample types and reducing overall manufacturing costs.
3Reliability
If the probe scans perpendicular to the sample plane, then the scanning mechanism is simple, but it cannot collect correct data from inclined surfaces
Solution Approach 1:
The patent implements dynamics by enabling the first scanner to tilt to different angles. This dynamic adjustment allows the scanning direction to be changed from perpendicular to non-perpendicular, enabling correct data collection from inclined surfaces and overhang structures while maintaining reasonable system complexity through standardized mechanical tilting mechanisms.
Data Source
AI summary
A scanning probe microscope tilts the scanning direction of a z-scanner by a precise amount and with high repeatability using a movable assembly that rotates the scanning direction of the z-scanner with respect to the sample plane. The movable assembly is moved along a curved guide by a rack-and-pinion drive system and has grooves that engage with corresponding ceramic balls formed on a stationary frame to precisely position the movable assembly at predefined locations along the curved guide. The grooves are urged against the ceramic balls via a spring force and, prior to movement of the movable assembly, a pneumatic force is applied to overcome the spring force and disengage the grooves from the ceramic balls.