Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory

Galović, S.; Djordjević, Katarina; Nesic, M. V.; Popović, Marica N.; Markushev, D. D.; Markushev, D. K.; Todorović, Dragana

doi:10.1063/5.0152519

Cited by 4 publications

(3 citation statements)

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“…By comparing the expressions describing the PA signal predicted by the fractional model Eqs.47-48 with the expressions describing the PA signal predicted by the classical model Eqs.42 and 46, for both types of optical impulse excitation, it is shown that the fractional models reduce to the classical for 1 υ = [80].…”

Section: Discussionmentioning

confidence: 99%

“…Taking into account that the microphone, which records pressure fluctuations, behaves as a differentiator of these fluctuations [32,80], the spectral function of the recorded PA signal is described by the expression:…”

Section: ( ) ( ) D X Q Xmentioning

confidence: 99%

“…We think that the cause of this behavior is related to the limitations of the thermal piston model [1,8,30]. Namely, this model, as discussed in [27,80], presupposes that the diffusion length of heat in the gas is much smaller than the dimensions of the cells. This assumption is completely justified for harmonics whose frequency is higher than 100 Hz [1], but for lower harmonics of very long pulse excitation, whose influence becomes expressed in the long-time domain, this assumption is not justified, and for a complete analysis of the PA signal, it is necessary to use a generalized model of transformation of variations temperature at the sample/gas boundary in pressure fluctuations in a PA cell of finite length [80].…”

Section: υ mentioning

confidence: 99%

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Influence of Local Thermodynamic Non-Equilibrium to Photothermally Induced Acoustic Response of Complex Systems

Galovic,

Djordjevic,

Kovacevic

et al. 2024

Preprint

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In this paper, the time-resolved model of photoacoustic signal for samples with a complex inner structure is derived including local non-equilibrium of structural elements with multiple degrees of freedom, i.e. structural entropy of the system. The local non-equilibrium is taken into account through the fractional operator. By analyzing the model for two types of time-dependent excitation, a very short pulse and a very long pulse, it is shown that the rates of non-equilibrium relaxations in complex samples can be measured by applying the derived model and time-domain measurements. Limitations of the model and further directions of its development are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: ( ) ( ) D X Q Xmentioning

confidence: 99%