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Exploitation de nouveaux phénomènes dans les systèmes nanoélectromécaniques : réalisation d'un nanorésonateur accordable

Abstract : This thesis focuses on new phenomena in the mechanical resonances of SiC nanowires (NWs) and carbon nanotubes (CNs) of interest for the emerging field of nano-electro-mechanical systems (NEMS). The clamped-free confiuration allowed the study of our nanowire and nanotube samples by field emission (FE), including measuring the Young's modulus and the quality factor (Q). Heating NW resonators significantly increased their Q factor (Qmax = 159 000). Self-oscillations were observed during FE where only a DC voltage was applied, thus allowing DC/AC conversion with a rate of up to » 50%. Using highly resistive NWs coupled with FE current was required to generate these spontaneous oscillations. Achieving a nanoradio under FE allowed the demodulation of AM or FM signals through the mechanical resonance of CNs. We describe a new method to excite vibrations of a NW from the electron beam of an electron microscope. The evolution of the charge at the end of NW is the main source of these self-oscillations. The clamped-clamped configuration consists of a transistor based on suspended CNs. The devices are characterized electrically and mechanically in a probe station under ultrahigh vacuum with mixing techniques. The resonance frequencies of these samples was around 100 MHz. The demodulation of an FM signal was achieved for the first time in this NEMS configuration. For all the phenomena discovered and treated in this manuscript, a model and derived simulations are described and discussed
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Submitted on : Monday, May 30, 2011 - 4:18:29 PM
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  • HAL Id : tel-00552278, version 2

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Vincent Gouttenoire. Exploitation de nouveaux phénomènes dans les systèmes nanoélectromécaniques : réalisation d'un nanorésonateur accordable. Autre [cond-mat.other]. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10234⟩. ⟨tel-00552278v2⟩

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