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Influence of edge effects on laser-induced surface displacement of opaque materials by photothermal interferometry
Flizikowski, G. A. S. (Author), Anghinoni, B. (Author), Rohling, J. H. (Author), Belançon, M. P. (Author), Mendes, R. S. (Author), Baesso, Mauro L. (Author), Malacarne, L. C. (Author), Požar, Tomaž (Author), Bialkowski, Stephen Edward (Author), Astrath, Nelson Guilherme Castelli (Author)

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Abstract
We demonstrate the influence of edge effects on the photothermal-induced phase shift measured by a homodyne quadrature laser interferometer and compare the experiments with rigorous theoretical descriptions of thermoelastic surface displacement of metals. The finite geometry of the samples is crucial in determining how the temperature is distributed across the material and how this affects the interferometer phase shift measurements. The optical path change due to the surface thermoelastic deformation and thermal lens in the surrounding air is decoded from the interferometric signal using analytical and numerical tools. The boundary/edge effects are found to be relevant to properly describe the interferometric signals. The tools developed in this study provide a framework for the study of finite size effects in heat transport in opaque materials and are applicable to describe not only the phase shift sensed by the interferometer but also to contribute to the photothermal-based technologies employing similar detection mechanisms.

Language:English
Keywords:photothermal mirror, interferometry, thermal expansion
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Number of pages:str. 1-10
Numbering:Vol. 128, iss. 4
UDC:519.6:531.715(045)
ISSN on article:0021-8979
DOI:10.1063/5.0015996 Link is opened in a new window
COBISS.SI-ID:24363523 Link is opened in a new window
Views:144
Downloads:119
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Record is a part of a journal

Title:Journal of applied physics
Shortened title:J. appl. physi.
Publisher:American Institute of Physics
ISSN:0021-8979
COBISS.SI-ID:4730378 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0392
Name:Optodinamika

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:L2-9254
Name:Prostorsko in časovno oblikovanje laserske svetlobe za minimalno invazivne oftalmološke posege

Secondary language

Language:Slovenian
Title:Vpliv robnih učinkov na lasersko induciran pomik površine neprozornih materialov s fototermalno interferometrijo
Abstract:
Prikažemo vpliv robnih učinkov na fototermalno inducirani fazni premik, ki ga merimo s homodinskim kvadraturnim laserskim interferometrom in poskuse primerjamo z eksaktnimi teoretičnimi opisi termoelastičnih površinskih premikov kovin. Končna geometrija vzorcev je ključnega pomena pri določanju, kako se temperatura porazdeli po materialu in kako to vpliva na merjenje faznega premika interferometra. Razliko optične poti zaradi površinske termoelastične deformacije in termalne leče v okoliškem zraku dekodiramo iz interferometričnega signala s pomočjo analitičnih in numeričnih orodij. Mejni/robni učinki so pomembni za pravilen opis interferometričnih signalov. Orodja, razvita v tej študiji, nudijo okvir za preučevanje učinkov zaradi končnih dimenzij pri prenosu toplote v neprozornih materialih in niso uporabna le za opisovanje faznega premika, ki ga zazna interferometer, temveč prispevajo tudi k fototermalnim tehnologijam, ki uporabljajo podobne mehanizme zaznavanja.

Keywords:fototermalno zrcalo, interferometrija, termoelastična ekspanzija

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