Surface plasmons in metallic nanoparticles: fundamentals and applications

García, M. A.

doi:10.1088/0022-3727/44/28/283001

Cited by 773 publications

(468 citation statements)

References 148 publications

(164 reference statements)

Supporting

Mentioning

442

Contrasting

Unclassified

Order By: Relevance

“…Thus the target composition and the laser coupling to the target -in order to have high absorption of laser radiation -become an important factor of the target irradiation. To enhance the absorption properties special metallic absorbent nanostructures can be embedded in thin targets to promote the surface plasmon resonance effect at the wavelength of the laser radiation being used [11]. Plasma properties in the different regimes can be investigated using fast diagnostics, such as time--of-fl ight diagnostics, semiconductor detectors and a Thomson parabola spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Ion acceleration from intense laser-generated plasma: methods, diagnostics and possible applications

Torrisi

2015

Nukleonika

View full text Add to dashboard Cite

Abstract. Many parameters of non-equilibrium plasma generated by high intensity and fast lasers depend on the pulse intensity and the laser wavelength. In conditions favourable for the target normal sheath acceleration (TNSA) regime the ion acceleration from the rear side of the target can be enhanced by increasing the thin foil absorbance through the use of nanoparticles and nanostructures promoting the surface plasmon resonance effect. In conditions favourable for the backward plasma acceleration (BPA) regime, when thick targets are used, a special role is played by the laser focal position with respect to the target surface, a proper choice of which may result in induced self-focusing effects and non-linear acceleration enhancement. SiC detectors employed in the time-of-fl ight (TOF) confi guration and a Thomson parabola spectrometer permit on-line diagnostics of the ion streams emitted at high kinetic energies. The target composition and geometry, apart from the laser parameters and to the irradiation conditions, allow further control of the plasma characteristics and can be varied by using advanced targets to reach the maximum ion acceleration. Measurements using advanced targets with enhanced the laser absorption effect in thin fi lms are presented. Applications of accelerated ions in the fi eld of ion source, hadrontherapy and nuclear physics are discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Ion acceleration from intense laser-generated plasma: methods, diagnostics and possible applications

Torrisi

2015

Nukleonika

View full text Add to dashboard Cite

show abstract

“…In the past decades, metallic nanoparticles either sustained on surfaces or dispersed in dielectric matrices have been extensively studied because of their pronounced optical and electrical properties [1][2][3][4][5][6][7][8]. Most of the studies have focused on localized surface plasmon excitation, which dominates the photoabsorption spectra in the visible range.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies have focused on localized surface plasmon excitation, which dominates the photoabsorption spectra in the visible range. In recent years, interest in the synthesis of dielectric-matrix-based bimetallic nanocomposites has intensified because of their considerable applications in nano-optical devices, especially in localized surface plasmon resonance spectroscopy and biosensing [3,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Meng

Shibayama

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

Effects of Ar-ion induced surface nanostructuring were studied using 100 keV Ar-ion irradiation of 30 nm Ag-Au bimetallic films deposited on Al 2 O 3 single crystals, under irradiation fluences ranging from 5.0 × 10 15 cm -2 to 6.3 × 10 16 cm -2 . Scanning electron microscope was used to study the ionbeam-induced surface nanostructuring. As the irradiation fluence increased, dewetting of the bimetallic films on the Al 2 O 3 substrate was observed, and formation of isolated Ag-Au nanostructures sustained on the substrate were obtained. Next, thermal annealing was performed under high vacuum at 1073 K for 2 hours; a layer of photosensitive Ag-Au alloy nanoballs partially embedded in the Al 2 O 3 substrate was obtained when higher fluence irradiation (> 3.8 × 10 16 cm -2 ) was used. The microstructures of the nanoballs were investigated using a transmission electron microscope, and the nanoballs were found to be single crystals with a FCC structure. In addition, photoabsorption spectra were measured, and localized surface plasmon resonance peaks were observed. With increase in the irradiation fluence, the size of the Ag-Au nanoballs on the substrate decreased, and a blue-shift of the LSPR peaks was observed. Further control of the LSPR frequency over a wide range was achieved by modifying the chemical components, and a red-shift of the LSPR peaks was observed as the Au concentration increased. In summary, ion irradiation is an effective approach toward surface nanostructuring, and the nanocomposites obtained have potential applications in optical devices.

show abstract

“…Although chemical transformations induced by visible irradiation are often assigned to the excitation of the plasmon band, it should be stressed that by irradiating at wavelengths higher than 400 nm, one not only induces the oscillation of the 6s valence band electrons, but also facilitates the promotion of the electrons from the 5d to 6s levels of Au nanoparticles. 41 At variance with the behaviour observed for Ag, the SPR band and the interband transitions in Au nanoparticles are partially overlapped. 41 It is also apparent that interband transitions dominate the absorption of the metal nanoparticles for wavelengths shorter than 475 nm, 41 a fact that has been recognized in very few cases in the reports on plasmonic photocatalysis.…”

Section: Tempol ↔ Tempol-h Interconversionmentioning

confidence: 86%

“…41 At variance with the behaviour observed for Ag, the SPR band and the interband transitions in Au nanoparticles are partially overlapped. 41 It is also apparent that interband transitions dominate the absorption of the metal nanoparticles for wavelengths shorter than 475 nm, 41 a fact that has been recognized in very few cases in the reports on plasmonic photocatalysis. [42][43][44] Thus, quantitative experiments were performed to evaluate the amount of TEMPOL regenerated as a function of the irradiation time by exciting the samples at 450 ± 12 and 530 ± 12 nm.…”

Section: Tempol ↔ Tempol-h Interconversionmentioning

confidence: 86%

Modulation of the electron transfer processes in Au–ZnO nanostructures

et al. 2015

View full text Add to dashboard Cite

Plasmonic nanostructures comprising Au and ZnO nanoparticles synthesized by the spontaneous reduction of HAuCl 4 in ethylene glycol were used to assess the possibility of modulating the direction of the electron transfer processes at the interface. One electron UV reduction and visible oxidation of the reversible couple TEMPOL/TEMPOL-H was confirmed by EPR spectroscopy. The apparent quantum yield for TEMPOL-H conversion under continuous wave visible excitation depends on the irradiation wavelength, being 0.57% and 0.27% at 450 ± 12 and 530 ± 12 nm, respectively. These results indicate that both the surface plasmon resonance and the interband transition from the 5d to the 6s level of Au nanoparticles contribute to the visible activity of the nanostructure. In addition, by detecting free electron conduction band electrons in ZnO, after the visible excitation of Au/ZnO nanostructures, we provide direct evidence of the photoexcited electron transfer from gold nanoparticles to ZnO.

show abstract

Surface plasmons in metallic nanoparticles: fundamentals and applications

Cited by 773 publications

References 148 publications

Ion acceleration from intense laser-generated plasma: methods, diagnostics and possible applications

Ion acceleration from intense laser-generated plasma: methods, diagnostics and possible applications

Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Modulation of the electron transfer processes in Au–ZnO nanostructures

Contact Info

Product

Resources

About