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AY17-18 NAVAL POSTGRADUATE SCHOOL DISTANCE …

Abstract:
Plasmonic metasurfaces are emerging as two-dimentional metamaterials capable of manipulating the phase, amplitude, and polarization of light on the nanoscale, which have been successfully demonstrated as abundant promising applications in advanced photonic devices [1]. Plasmonic nano-patterned colloidal metasurfaces enable light manipulation at the nanoscale [2-4]. However, a fast and controllable fabrication for such structures remains a major challenge in nano-optics. Here, we propose a strategy for rapid optically directed assembly (ODA) of colloidal metallic metasurfaces with ordered nano-patterns using orthogonal laser standing evanescent wave (LSEW) fields within less than 10 minutes. We demonstrate the underlying cooperative mechanism of optical forces exertions on colloidal nanoparticles (NPs) in orthogonal LSEW fields with a non-focused ultralow fluence irradiation of 0.25 Wcm-2, which leads to the formation of nano-patterned colloidal silver metasurface with a large area of 50 mm2. The demonstration of polarizations stabilizing during the nano-patterns formation confirmed by a polarization-dependent surface enhanced Raman spectroscopy (p-SERS) characterization substantiates further the interpretation of dynamical driving and binding processes of ODA. This unique combination of top-down nanostructured optical fields directing and bottom-up assembly provide an important foundation for designing and fabricating reconfigurable colloidal nano-patterned metasurfaces for nanoscale control of optical fields. This study constitutes the fundamental step for the fabrication of complex functional nanostructures based on the assembled NPs, which provides the capabilities and applications of optical trapping in new and intriguing ways and offers the perspectives on the rapidly emerging areas of nano-photonics and nano-biology.

Abstract:
Biofilms are three-dimensional structures that contains billions of genetically identical bacteria submerged in a self-produced extracellular matrix, which protect bacteria from antibiotics and the human immunological defenses. More than 85 % of chronic and/or recurrent human infections are linked to bacterial biofilms. In addition, spore-forming pathogenic bacteria represent an additional community threat because of their intrinsic refractory behavior against antibiotics, phagocytes and their easy utilization in bioterrorist attacks. Therefore, every day the available microbicide arsenal against biofilms and spores becomes scarcer. Accordingly, nano-material biotechnology emerges as a promising alternative for reducing the detrimental effects of microbial-related diseases. Here we describe the development of novel nanostructured coating systems with improved photocatalytic and antibacterial activities. These systems comprise, in one case, layers of SiO2 followed by layers of mesoporous or dense TiO2-anatase, and doping with silver nanoparticles (Ag NPs). In the other case, we developed Copper NPs and its oxides by a chemical method based on a bottom up approach and its stabilization using aminosilanes as surface modifiers. The activity of CuNPs and AgNPs (MNPs) was measured against spores and vegetative (planktonic and sessile) forms of the relevant human pathogens Enterohemorrhagic Escherichia coli (etiological agent of Hemolytic Uremic Syndrome), Listeria monocytogenes (etiological agent of septic abortion), Bacillus anthracis (etiological agent of Anthrax), Clostridium perfringens (etiological agent of food-associated diarrhea and Gas Gangrene), cystic-fibrosis related Pseudomona aeruginosa and methicillin-resistant Staphylococcus aureus ( etiological agent of sepsis and myocardiopathies). The planktonic and sessile growth (measured as the final cellular yield at 600 nm and crystal violet staining, respectively) of each pathogen, as well as the sporocide effect on C. perfringens and B. anthracis spores, was very significant at submillimolar concentrations of MNPs (95 % of vegetative growth inhibition and sporocide effect, p

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Abstract:
Biofilms are three-dimensional structures that contains billions of genetically identical bacteria submerged in a self-produced extracellular matrix, which protect bacteria from antibiotics and the human immunological defenses. More than 85 % of chronic and/or recurrent human infections are linked to bacterial biofilms. In addition, spore-forming pathogenic bacteria represent an additional community threat because of their intrinsic refractory behavior against antibiotics, phagocytes and their easy utilization in bioterrorist attacks. Therefore, every day the available microbicide arsenal against biofilms and spores becomes scarcer. Accordingly, nano-material biotechnology emerges as a promising alternative for reducing the detrimental effects of microbial-related diseases. Here we describe the development of novel nanostructured coating systems with improved photocatalytic and antibacterial activities. These systems comprise, in one case, layers of SiO2 followed by layers of mesoporous or dense TiO2-anatase, and doping with silver nanoparticles (Ag NPs). In the other case, we developed Copper NPs and its oxides by a chemical method based on a bottom up approach and its stabilization using aminosilanes as surface modifiers. The activity of CuNPs and AgNPs (MNPs) was measured against spores and vegetative (planktonic and sessile) forms of the relevant human pathogens Enterohemorrhagic Escherichia coli (etiological agent of Hemolytic Uremic Syndrome), Listeria monocytogenes (etiological agent of septic abortion), Bacillus anthracis (etiological agent of Anthrax), Clostridium perfringens (etiological agent of food-associated diarrhea and Gas Gangrene), cystic-fibrosis related Pseudomona aeruginosa and methicillin-resistant Staphylococcus aureus ( etiological agent of sepsis and myocardiopathies). The planktonic and sessile growth (measured as the final cellular yield at 600 nm and crystal violet staining, respectively) of each pathogen, as well as the sporocide effect on C. perfringens and B. anthracis spores, was very significant at submillimolar concentrations of MNPs (95 % of vegetative growth inhibition and sporocide effect, p

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