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Liu Y, Seresini T, Liu JY, Liu L, Wang F, Wang Y, Glorieux C. All-optical dynamic analysis of the photothermal and photoacoustic response of a microcantilever by laser Doppler vibrometry. PHOTOACOUSTICS 2021; 24:100299. [PMID: 34522609 PMCID: PMC8426265 DOI: 10.1016/j.pacs.2021.100299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/22/2021] [Accepted: 08/30/2021] [Indexed: 05/17/2023]
Abstract
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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Affiliation(s)
- Yang Liu
- Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Leuven, B-3001, Belgium
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, China
- School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Tommaso Seresini
- Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Leuven, B-3001, Belgium
| | - Jun-Yan Liu
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, China
- School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
- Corresponding author at: School of Mechatronics Engineering, Harbin Institute of Technology, Nangang District, Xidazhi Street 92, 150001, Harbin, Heilongjiang Province, China.
| | - Liwang Liu
- Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Leuven, B-3001, Belgium
| | - Fei Wang
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, China
- School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Yang Wang
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, China
- School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Christ Glorieux
- Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Leuven, B-3001, Belgium
- Corresponding author at: Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium.
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