Journal ArticleDOI
Harmonic heat flow in isotropic layered systems and its use for thin film thermal conductivity measurements
TLDR
In this article, a theoretical model is presented describing harmonic heat flow in a two-layer system heated by a modulated Gaussian laser beam Amplitude and phase of the modulated temperature rise in the layers, as well as in the backing substrate and adjacent atmosphere, are calculated by solving the three-dimensional heat conduction equation with a source term including exponential absorption of the laser light in one or two layers.Abstract:
A theoretical model is presented describing harmonic heat flow in a two layer system heated by a modulated Gaussian laser beam Amplitude and phase of the modulated temperature rise in the layers, as well as in the backing substrate and adjacent atmosphere, are calculated by solving the three‐dimensional heat conduction equation with a source term including exponential absorption of the laser light in one or two layers Heat conduction is assumed to be isotropic throughout the system, however, a thermal contact resistance between the two layers can be taken into account Results are presented for single and double layer systems of gold and various dielectric thin film materials on glass substrates Amplitude and phase of the harmonic temperature variation are calculated either as a function of position in the sample system or at the surface as a function of the laser beam modulation frequency It is found that both amplitude and phase of the calculated temperature rise exhibit typical thin film features iread more
Citations
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Journal ArticleDOI
High thermal conductivity of chain-oriented amorphous polythiophene
Virendra Singh,Thomas L. Bougher,Annie Weathers,Ye Cai,Kedong Bi,Michael T. Pettes,Sally A. McMenamin,Wei Lv,Daniel P. Resler,Todd R. Gattuso,David H. Altman,Kenneth H. Sandhage,Li Shi,Asegun Henry,Baratunde A. Cola +14 more
TL;DR: Thermal conductivity data suggest that, unlike in drawn crystalline fibres, in the authors' fibres the dominant phonon-scattering process at room temperature is still related to structural disorder, so effective heat transfer at critical contacts in electronic devices operating under high-power conditions at 200 °C over numerous cycles is demonstrated.
Journal ArticleDOI
Magnon, phonon, and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures
Michael Schreier,Akashdeep Kamra,Mathias Weiler,Jiang Xiao,Gerrit E. W. Bauer,Gerrit E. W. Bauer,Rudolf Gross,Sebastian T. B. Goennenwein +7 more
TL;DR: In this paper, the phonon, electron, and magnon temperature profiles in yttrium iron garnet/platinum bilayers were calculated by diffusive theory with appropriate boundary conditions, in particular taking into account interfacial thermal resistances.
Journal ArticleDOI
Thermal conductivity of thin metallic films measured by photothermal profile analysis
TL;DR: In this article, the authors measured the thermal conductivity of nickel and gold films on quartz (thickness 0.4-8 μm) by a modulated thermoreflectance technique recording the surface temperature profile.
Journal ArticleDOI
Photothermal measurements on optical thin films
Eberhard Welsch,Detlev Ristau +1 more
TL;DR: An overview of the application of the photothermal technique for optical as well as thermophysical characterizations of thin films is given, and emphasis is placed on the influence of both residual absorption and randomly distributed inhomogeneities in thin films on their laser-damage resistance.
Journal ArticleDOI
Measuring local thermal conductivity in polycrystalline diamond with a high resolution photothermal microscope
TL;DR: A photothermal microscope that provides micrometer lateral and sub-micrometer depth resolution was designed in this article, where thermal conductivity measurements with modulation frequencies up to 12 MHz on single grains in polycrystalline diamond demonstrate its lateral resolution power even for a highly conducting material.
References
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Book
Conduction of Heat in Solids
H. S. Carslaw,John Conrad Jaeger +1 more
TL;DR: In this paper, a classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems, including boundary value maximization.
Journal ArticleDOI
Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
TL;DR: In this article, a quantitative derivation for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system is presented. And the theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustical spectroscopy.
Journal ArticleDOI
Photothermal deflection spectroscopy and detection
TL;DR: The theory for a sensitive spectroscopy based on the photothermal deflection of a laser beam is developed and its implications for imaging and microscopy are given, and the sources of noise are analyzed.
Journal ArticleDOI
Thermo‐optical spectroscopy: Detection by the ’’mirage effect’’
TL;DR: In this paper, a new thermo-optical method based on the sensitive detection of thermal gradients adjacent to heated sample surfaces is described, and room and low-temperature experiments are performed using this technique, and its advantages over different methods are discussed.
Journal ArticleDOI
Temperature rise induced by a laser beam
TL;DR: In this paper, the spatial distribution of the temperature rise induced by a laser beam absorbed in a solid is reduced to a one-dimensional integral which is evaluated numerically, and a closed-form expression in terms of tabulated functions is obtained for the maximum temperature rise.