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Optics and acoustics with a single nano-object : environment effects

Abstract : In this thesis, the properties of a single nanoparticle have been tuned altering its environment. Specifically, in the first part of this work, the surface plasmon resonance of individual gold nanobipyramids has been experimentally studied under a pressure adjustable surrounding and its evolution physically framed thorough theoretical modeling.In order to access to the single nanoparticle optics while generating a hydrostatic high-pressure environment, a challenging combination of the spatial modulation spectroscopy technique with the diamond anvil cell method has been achieved.In the second part of the thesis, the acoustic vibrations of individual gold nanodisks on sapphire substrate has been experimentally characterized via pump&probe spectroscopy. Particular attention has been paid to their damping as a function of the disks aspect-ratio enlightening the presence of quality-factors enhancements.Numeric modeling has provided a physical insight for the observed amplifications, showing that modes hybridizations occur at specific aspect-ratios, potentially reducing the acoustic energy loss towards the interface disk/substrate
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Submitted on : Thursday, May 31, 2018 - 2:31:06 PM
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  • HAL Id : tel-01804173, version 1

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Fabio Medeghini. Optics and acoustics with a single nano-object : environment effects. Acoustics [physics.class-ph]. Université de Lyon, 2018. English. ⟨NNT : 2018LYSE1026⟩. ⟨tel-01804173⟩

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