A practical toolset for TERS experiments and analysis

• Autor(a) principal: Hudson Luiz Silva de Miranda
• Data de Publicação: 2020
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Repositório Institucional da UFMG
• Texto Completo: http://hdl.handle.net/1843/34709
• topic: Scientific instrumentation; Raman spectroscopy; Tip enhanced Raman spectroscopy; Nanotechnology; Graphene; Finite element method; Engenharia elétrica; Nanotecnologia; Grafeno; Raman, Espectroscopia de

This work proposes a set of hardware and software tools to improve the usability of tip-enhanced Raman spectroscopy (TERS) systems. TERS is capable of providing optical images with resolution beyond the light’s diffraction limit while also providing chemical and structural information, which makes it a technique of interest for nanoscience and nanotechnology applications. Specifically, this work aims to develop hardware and software solutions to better understand the TERS probe’s interaction with an electromagnetic field, providing insights on: optical probe alignment methods, optimization of probe’s constructive parameters and super-resolution. Aside from the development of the necessary instruments, this task also comprehends the study of TERS probe’s interaction with light via Finite Element Method simulations in addition to TERS experiments with graphene under a series of environmental conditions that affect the local electromagnetic field in a controlled manner. Furthermore, the work also comprehends the use of data analysis techniques, specifically Spectral Unmixing and Principal Component Analysis (PCA), with the objective of efficiently extracting information from hyperspectral images in a non supervised manner via dimensionality reduction.