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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7515
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dc.contributor.authorSankar, Pranitha-
dc.contributor.authorThomas, Jyothis-
dc.contributor.authorShashikala, H.D-
dc.contributor.author+1. Co_author-
dc.date.accessioned2020-08-14T05:39:28Z-
dc.date.available2020-08-14T05:39:28Z-
dc.date.issued2019-06-
dc.identifier.citationOptical Materials, 2019, Vol.95, p32-35en_US
dc.identifier.issn0925-3467-
dc.identifier.urihttp://hdl.handle.net/2289/7515-
dc.descriptionOpen Accessen_US
dc.description.abstractIn this work, an Ag nanoparticle colloidal suspension flowing in the form of a thin jet (250 μm) is irradiated by 150 femtosecond, 800 nm laser pulses to form a plasma which emits bremsstrahlung X-rays of up to 100 keV energy. The flowing jet ensures long-term durability of the plasma source during continuous laser irradiation. The laser pulse is p-polarized and the angle of incidence is normal to the jet surface, to optimize resonance absorption of laser radiation by the plasma electron density gradient. A 30-fold enhancement is observed in the X-ray yield in the nanoparticle suspension, compared to the precursor salt solution. This is because of the local field enhancement (LFE) associated with the localized surface plasmon resonance (LSPR) in Ag nanoparticles. Multiphoton ionization will be greatly enhanced in the presence of LFE, resulting in the generation of a relatively larger number of free electrons, which become “hot” electrons of high kinetic energy by resonance absorption. Bremsstrahlung in the X-ray regime occurs due to the deceleration of these hot electrons. Under identical excitation conditions the corresponding X-ray enhancement measured in Au nanoparticles is relatively lower at 18-fold. This decrease is due to the higher ionization potential of Au (9.22 eV) as compared to Ag (7.58 eV). On the other hand, absorption spectra and SEM images measured after continuous irradiation reveal that Au nanoparticles are more photostable compared to Ag nanoparticles. These studies show that Ag nanoparticles are better suited for X-ray generation compared to Au nanoparticles under the experimental conditions employed. Applications include dynamics studies, microscopy, and lithography.en_US
dc.language.isoenen_US
dc.publisherElesvier B.V.en_US
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0925346719302265en_US
dc.relation.urihttps://doi.org/10.1016/j.optmat.2019.03.055en_US
dc.rights2019, Elsevier B.V.en_US
dc.subjectLaser produced plasmaen_US
dc.subjectX-ray emissionen_US
dc.subjectMetal nanoparticleen_US
dc.subjectBremsstrahlung emissionen_US
dc.titleEnhanced bremsstrahlung X-ray emission from Ag nanoparticles irradiatedby ultrashort laser pulsesen_US
dc.typeArticleen_US
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