TRANSIENT THERMAL GRATINGS AT SURFACES FOR THERMAL CHARACTERIZATION OF BULK MATERIALS AND THIN-FILMS

被引:129
作者
KADING, OW [1 ]
SKURK, H [1 ]
MAZNEV, AA [1 ]
MATTHIAS, E [1 ]
机构
[1] FREE UNIV BERLIN,FACHBEREICH PHYS,D-14195 BERLIN,GERMANY
来源
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1995年 / 61卷 / 03期
关键词
D O I
10.1007/BF01538190
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Transient Thermal Gratings (TTGs) at surfaces of absorbing materials have been utilized for investigating heat diffusion in bulk materials and thin films. In this report, we describe the theoretical background of the technique and present experimental data. TTGs were excited in the surface plane by interference of two pulsed laser beams and monitored by a cw probe beam, either via temperature dependence of the reflectivity or by deflection from the displacement pattern. A theoretical model describing the thermal and thermoelastic surface response was developed, both for a homogeneous material and a multilayer structure. The potential of the technique will be demonstrated by experimental results on (i) thermal diffusivities of bulk materials, (ii) anisotropic lateral heat transport, acid (iii) thermal diffusivities of metal and diamond films. Furthermore, we will show that TTGs allow thermal depth profiling of inhomogeneous materials whenever there is a vertical gradient in thermal conductivity.
引用
收藏
页码:253 / 261
页数:9
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