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首页> 外文期刊>Physical review >Influence of electron-boundary scattering on thermoreflectance calculations after intra- and interband transitions induced by short-pulsed laser absorption
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Influence of electron-boundary scattering on thermoreflectance calculations after intra- and interband transitions induced by short-pulsed laser absorption

机译：电子边界散射对短脉冲激光吸收引起的带内和带间跃迁后热反射率计算的影响

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摘要

Ultrashort pulsed lasers are effective tools for use in a wide array of nanoscale applications, ranging from precise machining of nanomaterials, to deposition of nanocomposites, to diagnostics for observations of transport properties on atomistic time and length scales. One critical caveat of these applications is predicting and controlling the temperature of the materials after the absorbed laser pulse. At relatively low absorbed laser powers, the temperature can be determined from the reflected energy from the laser pulse off the sample surface as the reflectivity and the temperature change are linearly related. However, as laser pulses become more powerful, thereby inducing large temperature changes, and as materials continue to decrease in characteristic lengths, thereby causing substrate interference affecting the absorbed energy, the determination of the temperature from reflectance becomes more complicated than the traditionally assumed linear relation. In this work, a reflectance model is developed that accounts for large temperature fluctuations in thin-film metals by utilizing the temperature dependencies of the intraband ("free" electron) and interband ("bound" electron) dielectric functions and multiple reflection theory. Electron-electron, electron-phonon. and electron-substrate scattering are exploited and the change in reflectance as a function of these various scattering events is studied in the case of both intra- and interband excitations. This thermoreflectance model is compared to thermoreflectance data on thin Au films.
机译：超短脉冲激光器是有效的工具，可用于从纳米材料的精确加工到纳米复合材料的沉积，再到用于在原子时间和长度尺度上观察传输性质的诊断方法的各种纳米级应用。这些应用的关键警告之一是在吸收激光脉冲后预测和控制材料的温度。在吸收的激光功率相对较低的情况下，由于反射率与温度变化呈线性关系，因此可以根据来自样品表面的激光脉冲的反射能量确定温度。然而，随着激光脉冲变得更强大，从而引起较大的温度变化，并且随着材料的特征长度持续减小，从而导致基板干扰影响吸收的能量，从反射率确定温度的温度比传统假定的线性关系更加复杂。 。在这项工作中，开发了一种反射率模型，该模型通过利用带内（“自由”电子）和带间（“束缚”电子）介电函数的温度依赖性以及多重反射理论解决了薄膜金属中的较大温度波动。电子电子，电子声子。在带内和带间激发的情况下，利用电子和基底的散射，研究了反射率随这些各种散射事件而变化的变化。将该热反射模型与Au薄膜上的热反射数据进行比较。

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