Gold nanoparticles ion implanted in glass with enhanced nonlinear optical properties

Fukumi, Kohei; Chayahara, Akiyoshi; Kadono, Kohei; Sakaguchi, Toru; Horino, Y.; Miya, Masaru; Fujii, K.; Hayakawa, Junji; Satou, Mamoru

doi:10.1063/1.356156

Cited by 231 publications

(98 citation statements)

References 17 publications

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“…Epi-polished monocrystals of MgO͑100͒ of size 10ϫ10 ϫ1 mm 3 were implanted with 1.0ϫ10 16 cm Ϫ2 6 Li ions at an energy of 30 keV. After the implantation the crystals were annealed in air in steps from room temperature to 1200 K.…”

Section: Methodsmentioning

confidence: 99%

“…Metal and semiconductor nanoclusters are studied extensively because of their linear and nonlinear optical properties [1][2][3] and their electronic features as quantum dots. 4 -6 The optical and electronic properties are strongly dependent on the nanocluster size, which is due to quantum size effects such as the confinement of surface plasmons and the discretization of energy levels below a certain cluster size.…”

Section: Introductionmentioning

confidence: 99%

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Positron confinement in embedded lithium nanoclusters

et al. 2002

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Quantum confinement of positrons in nanoclusters offers the opportunity to obtain detailed information on the electronic structure of nanoclusters by application of positron annihilation spectroscopy techniques. In this work, positron confinement is investigated in lithium nanoclusters embedded in monocrystalline MgO. These nanoclusters were created by means of ion implantation and subsequent annealing. It was found from the results of Doppler broadening positron beam analysis that approximately 92% of the implanted positrons annihilate in lithium nanoclusters rather than in the embedding MgO, while the local fraction of lithium at the implantation depth is only 1.3 at. %. The results of two-dimensional angular correlation of annihilation radiation confirm the presence of crystalline bulk lithium. The confinement of positrons is ascribed to the difference in positron affinity between lithium and MgO. The nanocluster acts as a potential well for positrons, where the depth of the potential well is equal to the difference in the positron affinities of lithium and MgO. These affinities were calculated using the linear muffin-tin orbital atomic sphere approximation method. This yields a positronic potential step at the MgOʈLi interface of 1.8 eV using the generalized gradient approximation and 2.8 eV using the insulator model.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Positron confinement in embedded lithium nanoclusters

et al. 2002

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“…Therefore, at this optical frequency p, (3) eff( ) of the nano-composite can overtake giant values as a result of the enhancement reinforced by the power 4 of the form factor f( ) compared to those found in classical bulk materials. Degenerate four-wave mixing as well as Z-scan measurements in Ag and Au as well as Cu based nanocomposites consistently revealed the colossal third order nonlinear optical susceptibilities (3) eff( ) of about 10 -7 -10 -9 esu in the vicinity of the surface plasmon resonance, with response times of the order of picoseconds, Table 1, (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32). This enhanced (3) eff( ) offered by this new class of nanocomposites is opening new perspectives in emerging nanophotonics sector.…”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

Mâaza

Nemraoui²,

Sella

et al. 2005

Gold Bull

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A new type of photo-active nano-composite material appropriate for Ultra-fast Nonlinear Optical (3) ( ) applications has been synthesized and optically characterized. Compared to standard noble metal particles-oxide nano-composites exhibiting a superior effective (3) ( ) due to the enhancement of the local electric field, these Au-VO 2 nano-composites display an additional reversibly tunable surface plasmon frequency under external temperature stimuli. Such a smart plasmon tunability is correlated to the Mott's type semiconducting/metallic 1st order transition of the host VO 2 matrix. The nano-gold surface plasmon wavelength shifts reversibly from 645 nm to 598nm when the Au-VO 2 nano-composites temperature varies from 25°C to 120°C.

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“…To understand how these and other properties evolve from an atomic to a macroscopic state continues to be the most emotive cry in research on metal clusters and small particles. 2 On a more practical level, the unique optical properties of small metallic particles are exploited in the manufacturing of optical filters as labels for biomacromolecules, in reversible photosensitive monochromatic glasses, 3 for intensity enhancement in Raman spectroscopy (SER effect), 4 for optical switching based on their large, ultrafast nonlinear optical response, 5 and for optical trapping (or "tweezers"), based on their high polarizability. 6 For their beauty and resilience, colloidal gold suspensions have found numerous decorative applications, such as in purple of Cassius and in the ruby glasses dating to the Middle Ages.…”

Section: Introductionmentioning

confidence: 99%

Optical Absorption Spectra of Nanocrystal Gold Molecules

et al. 1997

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The optical absorption spectra of a series of nanocrystal gold moleculesslarger, crystalline Au clusters that are passivated by a compact monolayer of n-alkylthiol(ate)sshave been measured across the electronic range (1.1-4.0 eV) in dilute solution at ordinary temperature. Each of the ∼20 samples, ranging in effective core diameter from 1.4 to 3.2 nm (∼70 to ∼800 Au atoms), has been purified by fractional crystallization and has undergone a separate compositional and structural characterization by mass spectrometry and X-ray diffraction. With decreasing core mass (crystallite size) the spectra uniformly show a systematic evolution, specifically (i) a broadening of the so-called surface-plasmon band until it is essentially unidentifiable for crystallites of less than 2.0 nm effective diameter, (ii) the emergence of a distinct onset for strong absorption near the energy (∼1.7 eV) of the interbandgap (5d f 6sp), and (iii) the appearance in the smallest crystallites of a weak steplike structure above this onset, which is interpreted as arising from a series of transitions from the continuum d-band to the discrete level structure of the conduction band just above the Fermi level. The classical electrodynamic (Mie) theory, based on bulk optical properties, can reproduce this spectral evolutionsand thereby yield a consistent core-sizingsonly by making a strong assumption about the surface chemical interaction. Quantitative agreement with the spectral line shape requires a size-dependent offset of the frequency-dependent dielectric function, which may be explained by a transition in electronic structure just below 2.0 nm (∼200 atoms), as proposed earlier.

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Gold nanoparticles ion implanted in glass with enhanced nonlinear optical properties

Cited by 231 publications

References 17 publications

Positron confinement in embedded lithium nanoclusters

Positron confinement in embedded lithium nanoclusters

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

Optical Absorption Spectra of Nanocrystal Gold Molecules

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