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Combination of infrared synchrotron radiation with optical near-eld microscopy techniques

Abstract : My project is concerned with the development of an infrared apertureless scanning near-eld optical microscope (SNOM) that will use the synchrotron radiation of the ESRF as source of infrared light. This radiation has two main particularities well-suited to spectroscopic studies: this is a white source of light covering the near infrared band from 5 to 15 microns where tunable laser sources are still under development and it is very bright and stable, both in time and space. Once developed, the microscope will be applied to the infrared spectroscopy - essentially vibrational - and diagnosis of materials and of local nanostructures which are of current interest to the micro and nanoelectronic industry. As my project is very instrumental, the beginning was dedicated to the conception of a microscope system, starting with nothing and having all the needed materials at the end of the rst year. The second year was dedicated to the integration and implementation of the experimental setup, to the understanding of its functionalities and to trials for validating the new tool. Afterwards we were fully committed to researching and understanding this unique tool. We have started with some preliminary results and then it would essentially be a question of allocated experimental time until obtaining the results that we had aimed for. Our setup is unique and therefore the works we have for reference are from groups using the same techniques operating under very dierent conditions [WFA03; FWA05a; FWLA04; RGEH05; Hil04; GAS+00b; Suk04; TKH04] Our main diffculty is in detecting a weak signal, which we had expected to succeed. I will show later some calculations that made us believe so. One of our reference groups managed to do it in simpler conditions than ours, but it is worth recalling that it took them 3 years to adjust their setup sensitivity, thereby conrming that these are very hard techniques. Our starting idea was of using synchrotron radiation as illuminating source in the infrared range because of its characteristics. This is a white light source, with all the wavelengths present at the same time, allowing us to perform spectroscopy, meaning that we will obtain chemical information of the sample. This is the big novelty comparing with the other works. It turned out that the light is rather weak which makes the search for the signal a diffcult task. Our setup should then be tested with a laser, which is several orders of magnitude more powerful than the synchrotron radiation, and what might be a good debugging tool. This seems a good alternative to better understand what are the critical points that must be improved in our system. The lasers to use could be visible, infrared (CO2), or tunable. For spectroscopy, the tunable lasers are not only less stable but they are also more restricted in the spectral range to the very near infrared part of the spectrum than the synchrotron radiation. The ESRF synchrotron facility is my home lab, and I have worked in collaboration with the CEA-LETI for the development of this tool.
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https://tel.archives-ouvertes.fr/tel-00495332
Contributor : Miguel Silveira <>
Submitted on : Friday, June 25, 2010 - 3:12:00 PM
Last modification on : Monday, June 28, 2010 - 8:51:15 AM
Long-term archiving on: : Monday, October 22, 2012 - 2:50:50 PM

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  • HAL Id : tel-00495332, version 1

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Miguel Silveira. Combination of infrared synchrotron radiation with optical near-eld microscopy techniques. Physics [physics]. Université Joseph-Fourier - Grenoble I, 2009. English. ⟨tel-00495332⟩

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