| Autor: |
Stanojević, Neda, Markushev, Dragana K., Aleksić, Sanja M., Pantić, Dragan S., Galović, Slobodanka, Markushev, Dragan D., Ordonez-Miranda, Jose |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics |
| Popis: |
Based on the analogy between resistor-capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10-1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. © 2023 Author(s). The following article has been accepted by Journal of Applied Physics. After it is published, it will be found at [https://doi.org/10.1063/5.0152495]. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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