Investigations of Brillouin scattering at low temperature

低温布里渊散射的研究

• 批准号: 2759353
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2759353
• 关键词: Investigations; Brillouin; scattering; low; temperature

Brillouin scattering was first described theoretically 100 years ago and is now one of the strongest and most widely studied forms of optical nonlinearity. It is a three-wave mixing process between two optical fields and one acoustic field that can range from the MHz to GHz in frequency depending on which optical and mechanical modes are addressed. Thus far, most research in Brillouin scattering focusses on room temperature studies in a range of different materials and geometries, and there are some studies that also investigate Brillouin scattering down to 4 K. In this project, we aim to experimentally characterize Brillouin scattering in both amorphous and crystalline materials down to mK temperatures by performing these optical scattering experiments in a dilution refrigerator. These studies will elucidate the properties of the scattering mechanism, including the Brillouin scattering linewidth, with temperature and will allow us to identify important regions of parameter space for both amorphous and crystalline materials.

布里渊散射在100年前首次被理论描述，现在是光学非线性的最强和最广泛研究的形式之一。它是两个光场和一个声场之间的三波混频过程，其频率范围可以从MHz到GHz，这取决于解决的光学和机械模式。到目前为止，大多数布里渊散射的研究都集中在室温下不同材料和几何形状的研究上，也有一些研究将布里渊散射研究到4 K。在这个项目中，我们的目标是通过在稀释冰箱中进行这些光学散射实验来实验表征非晶和晶体材料中的布里渊散射，直到mK温度。这些研究将阐明的散射机制，包括布里渊散射线宽，与温度的属性，并将使我们能够确定重要的区域的参数空间的非晶和结晶材料。