Journal
PHOTOACOUSTICS
Volume 24, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2021.100299
Keywords
Cantilever; Photoacoustic; Photothermal; Modal analysis; Mode shape
Categories
Funding
- KU Leuven C1 project OPTIPROBE [C14/16/063]
- FWO (Research Foundation-Flanders) postdoctoral research fellowship [12V4419N]
- Foundation for Innovative Research Groups of theNational Nature Science Foundation of China [51521003]
- Chinese National Natural Science Foundation [61571153, 51173034]
- Self-planned Task of State Key Laboratory of Robotics and System (HIT) and the Programme of Introducing Talents of Discipline of Universities [B07108]
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Light absorption induced thermoelastic and photoacoustic excitation, combined with laser Doppler vibrometry, were used to analyze the dynamic mechanical behavior of a microcantilever. Three opto-mechanical generation mechanisms were identified, each initiated by modulated optical absorption and heating.
Light absorption induced thermoelastic and photoacoustic excitation, combined with laser Doppler vibrometry, was utilized to analyze the dynamic mechanical behavior of a microcantilever. The measured frequency response, modal shapes, and acoustic coupling effects were interpreted in the framework of a simple Bernouilli-Euler model and quantitative 3D finite element method (FEM) analysis. Three opto-mechanical generation mechanisms, each initiated by modulated optical absorption and heating, were identified both by an analytical and finite element model. In decreasing order of importance, optically induced cantilever bending is found to be caused by: (i) differences in photoacoustically induced pressure oscillations in the air adjacent to the illuminated and dark side of the cantilever, resulting from heat transfer from the illuminated cantilever to the nearby air, acting as a volume velocity piston, and (ii) thermoelastic stresses accompanying temperature and thermal expansion gradients in the cantilever, (iii) photoacoustically induced pressure oscillations in the air adjacent to the illuminated cantilever holder and frame.
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