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Micro cantilever movement detection with an amorphous silicon array of position sensitive detectors
Javier Contreras1, Daniel Costa, Sonia Pereira
1CENIMAT, Department of Materials Science, Faculty of Science and Technology of New University of Lisbon and CEMOP/UNINOVA, Campus da Caparica, 2928-516 Caparica, Portugal. ja@uninova.pt
Sensors (Basel, Switzerland)
|December 14, 2011
Summary
A novel portable system using amorphous silicon position sensitive detectors (PSDs) accurately tracks micro-cantilever movement. This technology achieves sub-micron spatial resolution, enabling precise micro-device analysis.
Area of Science:
- Micro- and Nanotechnology
- Instrumentation and Measurement
- Materials Science
Background:
- Micro-cantilevers are crucial components in various micro-devices, requiring precise motion tracking for performance evaluation.
- Existing methods for micro-cantilever motion detection can be complex and lack portability.
- Developing a compact and accurate system for micro-cantilever analysis is essential for advancing micro-device research.
Purpose of the Study:
- To develop and validate a portable data acquisition system for detecting micro-cantilever movement.
- To assess the spatial resolution and linearity of the developed system.
- To demonstrate the system's capability in tracking micro-cantilever dynamics.
Main Methods:
- A portable data acquisition system was constructed, integrating a 32-element linear array of 1D amorphous silicon position sensitive detectors (PSDs).
- The system was mounted on a microscope, and the movement of a micro-cantilever was tracked using the PSD array and a custom data algorithm.
- Photocurrent signals from the PSDs were analyzed to determine the micro-cantilever's X and Y positional changes.
Main Results:
- The system demonstrated a linear relationship between photocurrent and micro-cantilever movement in both X and Y directions, with approximately 3% non-linearity.
- A spatial resolution of less than 2 μm was achieved along the lateral sensor dimension and less than 3 μm along the perpendicular dimension when tracking the micro-cantilever.
- A superior spatial resolution of less than 1 μm was obtained when detecting the micro-cantilever's holding structure.
Conclusions:
- The developed portable data acquisition system effectively detects micro-cantilever movement with high accuracy and resolution.
- The system's linear response and sub-micron spatial resolution make it a valuable tool for micro-device characterization.
- This portable PSD-based system offers a promising solution for in-situ and field measurements of micro-mechanical systems.
