Optical control of phonons and their dissipation in nanostructures (A01)

本项目的目标是通过飞秒激光脉冲的激发产生和控制受限几何形状的相干声子。声子耗散（以及粗糙度和温度对其的影响）、模式转换、声子模式的调谐和耦合将在包含半导体、金属和新兴材料的系统中进行研究。表面声波的横向传播将扩展到纳米结构膜和三维系统。从这些系统中产生了新的途径来控制声子，例如热电特性，这些特性将作为温度的函数和高空间分辨率的不同环境的耦合进行研究。

The goal of this project is the generation and control of coherent acoustic phonons in confined geometries through the excitation with femtosecond laser pulses. Phonon dissipation (and the influence of roughness and temperature on it), mode conversion, tuning and coupling of phonon modes in systems containing semiconductors, metals and emerging classes of materials will be investigated. Lateral propagation of surface acoustic waves will be extended to nanostructured membranes and 3D systems. New pathways arise from these systems for the control of phonons with respect e.g. to the thermoelectric properties which will be investigated as function of temperature and coupling to different environments with high spatial resolution.