Instrumentation for a time-resolved micro-spectroscopy setup

用于时间分辨显微光谱设置的仪器

• 批准号: 448775637
• 金额: --
• 依托单位: Universität zu Köln
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/448775637?language=en
• 关键词: Instrumentation; time; resolved; micro; spectroscopy

With this proposal instrumentation for time-resolved spectroscopy is applied for. The instrumentation consists of a pulsed laser system (main instrument), spectrometer, and accessories. The applied for instrumentation will be combined with an existing self-developed low-temperature laser-scanning microscopy setup to form a time-resolved micro-spectroscopy setup for the optical spectroscopy of nanostructures and nanomaterials. The laser system applied for consists of a titanium:sapphire laser and an optical parametric oscillator. Together the two produce two trains of laser pulses with a pulse length below 200 fs. The wavelength of the pulses can be tuned broadly over a large part of the visible and near-infrared spectral region. The repetition rate of the laser system is 80 MHz and can be lowered with a pulse picker.The time-resolved micro-spectroscopy setup enabled by the applied for instrumentation will be used in the field of nano-optics, applying methods of optical spectroscopy and microscopy to explore light-matter interactions on the nanoscale. The system will give access to the study of dynamical processes in nanostructures and nanomaterials with a time-resolution below 1 ps. This will enable probing, e.g., charge carrier dynamics in nanoscale semiconductors and devices thereof. Additionally, the high peak power of the pulsed laser system will enable nonlinear optical studies of nanostructures, which is a second major area of research in which the applied for instrumentation will be used. Examples of research topics in which the system will be applied after commissioning are optical spectroscopy of graphene nanoribbons and in exploring the influence of order of pi-conjugated molecules on their optoelectronic properties. The large tunability of the wavelengths of the laser system makes it versatile guaranteeing its applicability in spectroscopic studies in the future.

该提案适用于时间分辨光谱仪器。仪器由脉冲激光系统（主机）、光谱仪和附件组成。所申请的仪器将与现有的自主开发的低温激光扫描显微镜装置相结合，形成用于纳米结构和纳米材料的光谱分析的时间分辨显微光谱装置。所申请的激光系统由钛宝石激光器和光学参量振荡器组成。两者共同产生脉冲长度低于 200 fs 的两串激光脉冲。脉冲的波长可以在大部分可见光和近红外光谱区域内广泛调谐。激光系统的重复率为80 MHz，可以通过脉冲选择器降低。由应用仪器实现的时间分辨微光谱装置将用于纳米光学领域，应用光谱和显微镜方法探索纳米尺度上的光与物质相互作用。该系统将以低于 1 ps 的时间分辨率研究纳米结构和纳米材料的动力学过程。这将使探测纳米级半导体及其器件中的载流子动力学等成为可能。此外，脉冲激光系统的高峰值功率将使纳米结构的非线性光学研究成为可能，这是应用仪器的第二个主要研究领域。该系统在调试后将应用的研究课题包括石墨烯纳米带的光谱学以及探索π共轭分子的有序度对其光电特性的影响。激光系统波长的大可调性使其具有多种用途，保证了其在未来光谱研究中的适用性。