In this paper, a theoretical model of temperature variations is derived for a two-layer optically absorbing structure, including thermal memory effects. It is considered that the two-layer structure is surrounded by gas and illuminated on the front side by a harmonically modulated laser beam. This model is based on the hyperbolic theory of heat conduction and Beer–Lambert's law of absorption neglecting multiple optical reflections in each layer. The derived model represents the generalization of the current models in two aspects. First, the influence of thermal memory properties of both layers is accounted for, and second, both layers are regarded as volume absorbers of the incident light. Based on the derived model, the expressions for surface temperature variations are given and discussed for the special type of two-layer structures, irradiated on the coated side, which is a prominent configuration in photoacoustic and photothermal experiments. It is shown that there exists a frequency range in which the influence of the thermal properties of the coating cannot be neglected, especially at the high-frequency range in which thermal memory of coating becomes significant. It is an important result in terms of understanding experimentally measured photothermal and photoacoustic response and, consequently, accurate characterizations of various high optically reflected and/or optically transparent samples by using these experimental techniques.
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7 January 2021
Research Article|
January 05 2021
Optically induced temperature variations in a two-layer volume absorber including thermal memory effects
Special Collection:
Photothermics
M. N. Popovic
;
M. N. Popovic
a)
1
Department of Atomic Physics, “Vinca” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade
, Mike Petrovica Alasa 12-14, 11351 Belgrade, Serbia
a)Author to whom correspondence should be addressed: maricap@vin.bg.ac.rs
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D. D. Markushev
;
D. D. Markushev
b)
2
Institute of Physics, National Institute of the Republic of Serbia, University of Belgrade
, Pregrevica 118, 11080 Belgrade-Zemun, Serbia
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M. V. Nesic
;
M. V. Nesic
c)
1
Department of Atomic Physics, “Vinca” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade
, Mike Petrovica Alasa 12-14, 11351 Belgrade, Serbia
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M. I. Jordovic-Pavlovic
;
M. I. Jordovic-Pavlovic
d)
3
College of Applied Sciences Uzice
, Trg Svetog Save 34, 31000 Uzice, Serbia
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S. P. Galovic
S. P. Galovic
e)
1
Department of Atomic Physics, “Vinca” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade
, Mike Petrovica Alasa 12-14, 11351 Belgrade, Serbia
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a)Author to whom correspondence should be addressed: maricap@vin.bg.ac.rs
b)
E-mail: dragan.markushev@ipb.ac.rs
c)
E-mail: mioljub.nesic@vin.bg.ac.rs
e)
E-mail: bobagal@vin.bg.ac.rs
Note: This paper is part of the Special Topic on Photothermics.
J. Appl. Phys. 129, 015104 (2021)
Article history
Received:
June 01 2020
Accepted:
December 10 2020
Citation
M. N. Popovic, D. D. Markushev, M. V. Nesic, M. I. Jordovic-Pavlovic, S. P. Galovic; Optically induced temperature variations in a two-layer volume absorber including thermal memory effects. J. Appl. Phys. 7 January 2021; 129 (1): 015104. https://doi.org/10.1063/5.0015898
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