Gold nanoparticles electric-field enhancement

The last problem of this series concerns femtosecond laser ablation from gold nanoparticles [87]. In this process, solid material transforms into a volatile phase initiated by rapid deposition of energy. This ablation is nonthermal in nature. Material ejection is induced by the enhancement of the electric field close to the curved nanoparticle surface. This ablation is achievable for laser excitation powers far below the onset of general catastrophic material deterioration, such as plasma formation or laser-induced explosive boiling. Anisotropy in the ablation pattern was observed. It coincides with a reduction of the surface barrier from water vaporization and particle melting. This effect limits any high-power manipulation of nanostructured surfaces such as surface-enhanced Raman measurements or plasmonics with femtosecond pulses. 

The last problem of this series concerns femtosecond laser ablation from gold nanoparticles [87]. In this process, solid material transforms into a volatile phase initiated by rapid deposition of energy. This ablation is nonthermal in nature. Material ejection is induced by the enhancement of the electric field... 

MEMS Biosensors Based on Nanoparticles Nanoparticles are often utilized as an analyte recognition element in MEMS biosensors. Nanoparticles have a quite large sensing area mainly due to their extremely small size. This enhances the reaction possibility of biomolecules. Furthermore, sensitivity of the biosensor can be increased when metal nanoparticles are positioned between two metal electrodes. When the analyte conjugated with metal nanoparticle is captured between two electrodes, the electric field intensity is amplified. Gold, silver, metal oxide and magnetic nanoparticles are widely used for detection... 

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