During the last decade, surface plasmon resonance (SPR) has become widely used to characterize a biological surface and to characterize binding events in the fields of chemistry and biochemistry. Research in this field has been favoured by the tremendous growth in nanofabrication methods among which soft lithographies are alternatively emerging. The purpose of this thesis work was to develop soft UV nanoimprint lithography, an emerging flexible technology allowing patterning on large area of subwavelength photonic nanostructures. The main advantages offered by soft UV nanoimprint lithography concern the simple patterning procedure and the low cost of the experimental setup (see state-of-art presented in chapter 1). Chapters 2 and 3 present the fabrication of master stamps, the study of nanoimprinting parameters coupled with the optimization of the etching process in order to get metallic nanostructures with limited pattern defects. The physical mechanisms of the transmission phenomenon exalted by surface plasmons were studied based on arrays of imprinted gold nanoholes (chapter 4). Extraordinary light transmission has been experimentally demonstrated. The geometrical effects on the position transmission peak were systematically analyzed. Proof-of-concept measurements performed in simple fluidic device indicate a response to small changes in refractive index in the surface vicinity. Finally, chapter 5 proposes a novel design for the optical sensor which is based on "nanocavities" exhibiting coupled localized plasmons. This LSPR sensor offers an improvement of one order of magnitude of the Figure of Merit compared to classical LSPR sensors. The resonance properties of these innovative nanocavities have been studied from numerical simulations and discussed based on their geometrical dependence. Since this system has demonstrated higher sensitivity for detection of biomolecules, it is thus fully adapted to study immunochemical binding interactions.
| Identifer | oai:union.ndltd.org:CCSD/oai:tel.archives-ouvertes.fr:tel-00591992 |
| Date | 21 April 2011 |
| Creators | Chen, Jing |
| Publisher | Université Paris Sud - Paris XI |
| Source Sets | CCSD theses-EN-ligne, France |
| Language | English |
| Detected Language | English |
| Type | PhD thesis |
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