Photothermal Probe Actuation via Non-Parallel Beamlets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional parallel scanning probe microscopy systems are inflexible and costly due to the complexity of integrated piezo-resistive sensors and zinc oxide Z-actuators, limiting their widespread use and requiring redesign for simple parameter changes like cantilever pitch or spring constant, and existing photothermal actuation methods are not scalable for multiple probe control due to increased optical component alignment challenges.
Innovation Solution
A method of actuating multiple probes using a single input beam transformed into non-parallel actuation beamlets, which are sequentially directed across the probes to deliver varying amounts of photothermal energy, allowing independent control of probe positions and enabling flexible and efficient scanning of a large array of probes with minimal scanning motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple independent actuation systems are used for each cantilever in parallel SPM, then scanning speed is improved, but device complexity and cost increase significantly
Solution Approach 1:
Multiple actuation functions are merged into a single piezoelectric element. The element is configured with multiple electrodes that can be independently controlled, allowing multiple cantilevers to be actuated simultaneously through different voltage patterns applied to the same physical component, thereby reducing overall system complexity while maintaining parallel scanning capability
Solution Approach 2:
A single piezoelectric element serves multiple functions by acting as the actuation mechanism for multiple cantilevers. Through independent electrode control, this universal actuator can generate different motion patterns for each cantilever, enabling one component to replace what would traditionally require multiple separate actuators
2Adaptability or versatility
If integrated piezo-resistive sensors and zinc oxide Z-actuators are used in each cantilever, then parallel probe detection and actuation are achieved, but manufacturing flexibility is reduced and fabrication cost increases
Solution Approach 1:
The piezoelectric element is segmented into multiple independently controllable electrode regions. This segmentation allows different sections of the same actuator to control different cantilevers, enabling flexible configuration changes without requiring complete redesign of the fabrication process. Standard cantilever arrays can be used with software-controlled electrode patterns
Solution Approach 2:
An intermediary control system is introduced between the voltage source and the cantilevers through the multi-electrode piezoelectric element. This intermediary structure allows flexible routing and distribution of actuation signals to different cantilevers based on operational requirements, providing adaptability without modifying the physical cantilever structure or fabrication process
3Speed
If photothermal actuation with multiple separate laser beams is used for multiple probes, then rapid response time is achieved, but optical alignment complexity increases
Solution Approach 1:
Multiple separate laser beams are merged into a single laser source. The single beam is then split and directed to multiple cantilevers through the piezoelectric actuation system, maintaining the rapid response characteristics of photothermal actuation while eliminating the need for multiple independent optical paths and their associated alignment complexities
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
This approach allows for flexible and efficient scanning of multiple probes with reduced complexity and cost, achieving rapid response times and high precision while maintaining compatibility with conventional SPM systems, enabling applications like EUV mask inspection and biosensing.
Implementation Method 1
transforming the input beam with the optical device into a plurality of actuation beamlets which are not parallel with each other
Implementation Method 2
delivering photothermal energy to the probes so that the probes are heated and deform relative to a sample
Implementation Method 3
used to induce photothermal bending of the cantilever
Implementation Method 4
scanning the actuation beamlets across the probes (optionally via an objective lens)
Implementation Method 5
the probes are heated and deform relative to a sample
Data Source
AI summary
A method of actuating a plurality of probes by delivering photothermal energy to the probes so that the probes are heated and deform relative to a sample. The photothermal energy is delivered to the probes by: directing an input beam into an optical device; transforming the input beam with the optical device into a plurality of actuation beamlets which are not parallel with each other; and scanning the actuation beamlets across the probes, optionally via an objective lens. A spacing between the actuation beamlets is different to a spacing between the probes so that only a subset (typically only one) of the actuation beamlets illuminates a probe at any instant. As the actuation beamlets scan across the probes the probes are illuminated in an illumination sequence. The actuation beamlets are controlled so that different amounts of photothermal energy are delivered to at least two of the probes during the illumination sequence.