Simple optical knife-edge effect based motion detection approach for a microcantilever
| Autor: | Wonki Kim, Taejoon Kouh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Knife-edge effect Cantilever Materials science Physics and Astronomy (miscellaneous) business.industry Photodetector Motion detection 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vibration Responsivity Optics Simple (abstract algebra) 0103 physical sciences 0210 nano-technology business |
| Zdroj: | Applied Physics Letters. 116:163104 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0005924 |
| Popis: | Here, we describe a simple optical motion detection method for a microcantilever by positioning a microcantilever in front of a photodetector and focusing a light to the side of the cantilever in the in-plane direction. The out-of-plane vibration of the microcantilever, acting as an knife-edge itself, modulates the amount of light reaching the photodetector, allowing the alternate motion detection scheme. The method presented offers the optical responsivity around 0.3 mW/μm, which is high enough to observe the thermomechanical fluctuations of a microcantilever in order of a few pm/ Hz. The demonstrated detection scheme can reduce the complexity and the relative size of the detection configuration, often required in the conventional methods, and would be useful as a complementary technique to existing ones. |
| Databáze: | OpenAIRE |
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