arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.04833physics.ins-detcond-mat.mtrl-sci
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基于离轴抛物柱面镜的扫描隧道显微镜发光实验装置的设计与实现

Design and implementation of a device based on an off-axis parabolic mirror to perform luminescence experiments in a scanning tunneling microscope

Ricardo Javier Peña Román, Yves Auad, Lucas Grasso, Lazaro A Padilha, Fernando Alvarez, Ingrid David Barcelos, Mathieu Kociak, Luiz Fernando Zagonel

摘要:

我们提出的设计,实施和说明性的结果的光收集/注入策略的基础上的离轴抛物柱面镜收集器的低温扫描隧道显微镜(STM)。该设备允许我们进行STM诱导光发射(STM-LE)和阴极发光(STM-CL)实验以及原位光致发光(PL)和拉曼光谱作为补充技术。考虑到扩展量守恒并使用离轴抛物柱面镜,可以设计一种光收集和注入系统,其显示72%的收集效率(考虑样品表面上方的半球),同时保持高光谱分辨率并最小化信号损失。STM的性能测试原子分辨图像和扫描隧道光谱的结果在标准样品表面。通过在金属表面和二维半导体样品上进行STM-LE,观察等离子体和激子发射,证明了我们系统的能力。此外,我们还对半导体单层和量子点进行了原位PL测量,并对石墨和六方氮化硼(h-BN)样品进行了原位Raman测量。此外,STM-CL和PL获得单层h-BN收集发光光谱,通常与间隙内状态有关的碳缺陷。结果表明,基于离轴抛物柱面镜的光注入和光收集装置是一种有效的工具,可以利用多种光谱技术研究纳米结构的原子尺度形貌和电子结构。

英文摘要:

We present the design, implementation, and illustrative results of a light collection/injection strategy based on an off-axis parabolic mirror collector for a low-temperature Scanning Tunneling Microscope (STM). This device allows us to perform STM induced Light Emission (STM-LE) and Cathodoluminescence (STM-CL) experiments and in situ Photoluminescence (PL) and Raman spectroscopy as complementary techniques. Considering the Étendue conservation and using an off-axis parabolic mirror, it is possible to design a light collection and injection system that displays 72% of collection efficiency (considering the hemisphere above the sample surface) while maintaining high spectral resolution and minimizing signal loss. The performance of the STM is tested by atomically resolved images and scanning tunneling spectroscopy results on standard sample surfaces. The capabilities of our system are demonstrated by performing STM-LE on metallic surfaces and two-dimensional semiconducting samples, observing both plasmonic and excitonic emissions. In addition, we carried out in situ PL measurements on semiconducting monolayers and quantum dots and in situ Raman on graphite and hexagonal boron nitride (h-BN) samples. Additionally, STM-CL and PL were obtained on monolayer h-BN gathering luminescence spectra that are typically associated with intragap states related to carbon defects. The results show that the flexible and efficient light injection and collection device based on an off-axis parabolic mirror is a powerful tool to study several types of nanostructures with multiple spectroscopic techniques in correlation with their morphology at the atomic scale and electronic structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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